91555660 has 24 divisors (see below), whose sum is σ = 219733920. Its totient is φ = 31390464.

The previous prime is 91555657. The next prime is 91555687. The reversal of 91555660 is 6655519.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326845 + ... + 327124.

It is an arithmetic number, because the mean of its divisors is an integer number (9155580).

Almost surely, 2^91555660 is an apocalyptic number.

It is an amenable number.

91555660 is an abundant number, since it is smaller than the sum of its proper divisors (128178260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91555660 is a wasteful number, since it uses less digits than its factorization.

91555660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653985 (or 653983 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 37.

The square root of 91555660 is about 9568.4721873453. The cubic root of 91555660 is about 450.7077915021.

The spelling of 91555660 in words is "ninety-one million, five hundred fifty-five thousand, six hundred sixty".