91972064 has 24 divisors (see below), whose sum is σ = 182769048. Its totient is φ = 45554560.

The previous prime is 91972007. The next prime is 91972093. The reversal of 91972064 is 46027919.

It is a super-3 number, since 3×91972064³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10007 + ... + 16854.

It is an arithmetic number, because the mean of its divisors is an integer number (7615377).

Almost surely, 2^91972064 is an apocalyptic number.

It is an amenable number.

91972064 is a deficient number, since it is larger than the sum of its proper divisors (90796984).

91972064 is a wasteful number, since it uses less digits than its factorization.

91972064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26978 (or 26970 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 91972064 is about 9590.2066713914. The cubic root of 91972064 is about 451.3900457734.

The spelling of 91972064 in words is "ninety-one million, nine hundred seventy-two thousand, sixty-four".