91664712 has 24 divisors (see below), whose sum is σ = 248258790. Its totient is φ = 30554880.

The previous prime is 91664707. The next prime is 91664717. The reversal of 91664712 is 21746619.

91664712 is a `hidden beast` number, since 9 + 1 + 6 + 647 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (91664707) and next prime (91664717).

It can be written as a sum of positive squares in only one way, i.e., 78747876 + 12916836 = 8874^2 + 3594^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (91664717) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 636489 + ... + 636632.

Almost surely, 2^91664712 is an apocalyptic number.

It is an amenable number.

91664712 is an abundant number, since it is smaller than the sum of its proper divisors (156594078).

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

91664712 is a wasteful number, since it uses less digits than its factorization.

91664712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273133 (or 1273126 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 91664712 is about 9574.1689978817. The cubic root of 91664712 is about 450.8866666059.

The spelling of 91664712 in words is "ninety-one million, six hundred sixty-four thousand, seven hundred twelve".