91566972 has 36 divisors (see below), whose sum is σ = 264527536. Its totient is φ = 26161920.

The previous prime is 91566967. The next prime is 91566977. The reversal of 91566972 is 27966519.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91566967) and next prime (91566977).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×91566972² = 16769020722497568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91566977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181429 + ... + 181932.

Almost surely, 2^91566972 is an apocalyptic number.

It is an amenable number.

91566972 is an abundant number, since it is smaller than the sum of its proper divisors (172960564).

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

91566972 is a wasteful number, since it uses less digits than its factorization.

91566972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363378 (or 363373 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 91566972 is about 9569.0632770402. The cubic root of 91566972 is about 450.7263528762.

The spelling of 91566972 in words is "ninety-one million, five hundred sixty-six thousand, nine hundred seventy-two".