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<S>                                                                    <C>
 
PROSPECTUS SUPPLEMENT                                                     FILE NO. 333-44173
(TO PROSPECTUS DATED JANUARY 29, 1998 AND PROSPECTUS SUPPLEMENT DATED         RULE 424(B)(3)
MARCH 12, 1998)
PROSPECTUS NUMBER: 1739
 
 
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                           MERRILL LYNCH & CO., INC.
                          MEDIUM-TERM NOTES, SERIES B
                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE
                              FLOATING RATE NOTES
 
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<S>                     <C>                 <C>                                  <C>
 
PRINCIPAL AMOUNT:       $40,000,000              ORIGINAL ISSUE DATE:            June 29, 1998
 
 
CUSIP NUMBER:           59018S L77               STATED MATURITY DATE:           January 28, 2000
 
 
INTEREST CALCULATION:                            DAY COUNT CONVENTION:
/x/ REGULAR FLOATING RATE NOTE                   /x/ ACTUAL/360
/ / INVERSE FLOATING RATE NOTE                   / / 30/360
(FIXED INTEREST RATE):                           / / ACTUAL/ACTUAL
 
 
INTEREST RATE BASIS:
/x/ LIBOR                                        / / COMMERCIAL PAPER RATE
/ / CMT RATE                                     / / ELEVENTH DISTRICT COST OF FUNDS RATE
/ / PRIME RATE                                   / / CD RATE
/ / FEDERAL FUNDS RATE                           / / OTHER (SEE ATTACHED)
/ / TREASURY RATE
DESIGNATED CMT PAGE:                             DESIGNATED LIBOR PAGE:
CMT TELERATE PAGE:                               LIBOR TELERATE PAGE: 3750
CMT REUTERS PAGE:                                LIBOR REUTERS PAGE:
 
 
INDEX MATURITY:         Quarterly                MINIMUM INTEREST RATE:          Not Applicable
 
 
SPREAD:                 -0.050%                  MAXIMUM INTEREST RATE:          Not Applicable
 
 
INITIAL INTEREST RATE:  5.60625%                 SPREAD MULTIPLIER:              Not Applicable
 
 
INTEREST RESET DATES:   On June 28, 1998 based on 1 month LIBOR, and Quarterly on the 28th of July,
                        October, January, April to Maturity, subject to modified following business day
                        convention.
 
 
INTEREST PAYMENT DATES: The 28th of July, October, January, and April, commencing July 28, 1998 to
                        Maturity, subject to modified following business day convention.
 
 
REPAYMENT AT THE
OPTION OF THE HOLDER:   The Notes cannot be repaid prior to the Stated Maturity Date.
 
 
REDEMPTION AT THE
OPTION OF THE COMPANY:  The Notes cannot be redeemed prior to the Stated Maturity Date.
 
 
FORM:                   The Notes are being issued in fully registered book-entry form.
 
 
TRUSTEE:                The Chase Manhattan Bank
 
 
DATED:                  June 25, 1998
 
 
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