91664012 has 24 divisors (see below), whose sum is σ = 181031760. Its totient is φ = 40228160.

The previous prime is 91663997. The next prime is 91664033. The reversal of 91664012 is 21046619.

It is a super-2 number, since 2×91664012² = 16804582191872288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34643 + ... + 37194.

It is an arithmetic number, because the mean of its divisors is an integer number (7542990).

Almost surely, 2^91664012 is an apocalyptic number.

It is an amenable number.

91664012 is a deficient number, since it is larger than the sum of its proper divisors (89367748).

91664012 is a wasteful number, since it uses less digits than its factorization.

91664012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71881 (or 71879 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 91664012 is about 9574.1324411144. The cubic root of 91664012 is about 450.8855188670.

The spelling of 91664012 in words is "ninety-one million, six hundred sixty-four thousand, twelve".