91040656 has 40 divisors (see below), whose sum is σ = 202129920. Its totient is φ = 38913024.

The previous prime is 91040641. The next prime is 91040671. The reversal of 91040656 is 65604019.

It is an interprime number because it is at equal distance from previous prime (91040641) and next prime (91040671).

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, 52800 + ... + 54496.

It is an arithmetic number, because the mean of its divisors is an integer number (5053248).

Almost surely, 2^91040656 is an apocalyptic number.

It is an amenable number.

91040656 is an abundant number, since it is smaller than the sum of its proper divisors (111089264).

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

91040656 is a wasteful number, since it uses less digits than its factorization.

91040656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191 (or 2185 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 91040656 is about 9541.5227296276. The cubic root of 91040656 is about 449.8611192824.

The spelling of 91040656 in words is "ninety-one million, forty thousand, six hundred fifty-six".