91765972 has 12 divisors (see below), whose sum is σ = 169042720. Its totient is φ = 43468056.

The previous prime is 91765937. The next prime is 91765979. The reversal of 91765972 is 27956719.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91765979) 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, 603648 + ... + 603799.

Almost surely, 2^91765972 is an apocalyptic number.

It is an amenable number.

91765972 is a deficient number, since it is larger than the sum of its proper divisors (77276748).

91765972 is a wasteful number, since it uses less digits than its factorization.

91765972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207470 (or 1207468 counting only the distinct ones).

The product of its digits is 238140, while the sum is 46.

The square root of 91765972 is about 9579.4557256663. The cubic root of 91765972 is about 451.0526337164.

The spelling of 91765972 in words is "ninety-one million, seven hundred sixty-five thousand, nine hundred seventy-two".