91975616 has 28 divisors (see below), whose sum is σ = 186403488. Its totient is φ = 45007872.

The previous prime is 91975607. The next prime is 91975619. The reversal of 91975616 is 61657919.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91975619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12281 + ... + 18296.

Almost surely, 2^91975616 is an apocalyptic number.

It is an amenable number.

91975616 is an abundant number, since it is smaller than the sum of its proper divisors (94427872).

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

91975616 is a wasteful number, since it uses less digits than its factorization.

91975616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30636 (or 30626 counting only the distinct ones).

The product of its digits is 102060, while the sum is 44.

The square root of 91975616 is about 9590.3918585217. The cubic root of 91975616 is about 451.3958566567.

The spelling of 91975616 in words is "ninety-one million, nine hundred seventy-five thousand, six hundred sixteen".