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<S>                                                                  <C>
 
PROSPECTUS SUPPLEMENT                                                   FILE NO. 333-44173
(TO THE PROSPECTUS DATED JANUARY 29, 1998 AND PROSPECTUS SUPPLEMENT         RULE 424(B)(3)
DATED MARCH 12, 1998)
PROSPECTUS NUMBER: 1729
 
 
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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:       $100,000,000             ORIGINAL ISSUE DATE:            June 17, 1998
 
 
CUSIP NUMBER:           59018S K52               STATED MATURITY DATE:           June 18, 2001
 
 
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:         Three Months             MINIMUM INTEREST RATE:          Not Applicable
 
 
SPREAD:                 0.070%                   MAXIMUM INTEREST RATE:          Not Applicable
 
 
INITIAL INTEREST RATE:  5.7575%                  SPREAD MULTIPLIER:              Not Applicable
 
 
INTEREST RESET DATES:   Quarterly, on the 18th, of March, June, September and December, commencing
                        September 18,1998; subject to modified following business day convention.
 
 
INTEREST PAYMENT DATES: Quarterly, on the 18th, of March, June, September and December, commencing
                        September 18,1998; 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 12, 1998
 
 
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