91764057 has 32 divisors (see below), whose sum is σ = 155151360. Its totient is φ = 46854720.

The previous prime is 91764031. The next prime is 91764067. The reversal of 91764057 is 75046719.

It is not a de Polignac number, because 91764057 - 2⁷ = 91763929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91764017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10263 + ... + 16995.

It is an arithmetic number, because the mean of its divisors is an integer number (4848480).

Almost surely, 2^91764057 is an apocalyptic number.

It is an amenable number.

91764057 is a deficient number, since it is larger than the sum of its proper divisors (63387303).

91764057 is a wasteful number, since it uses less digits than its factorization.

91764057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 91764057 is about 9579.3557716581. The cubic root of 91764057 is about 451.0494961270.

The spelling of 91764057 in words is "ninety-one million, seven hundred sixty-four thousand, fifty-seven".