997664502 has 32 divisors (see below), whose sum is σ = 2116915200. Its totient is φ = 312566688.

The previous prime is 997664477. The next prime is 997664557. The reversal of 997664502 is 205466799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19977 + ... + 48932.

It is an arithmetic number, because the mean of its divisors is an integer number (66153600).

Almost surely, 2^997664502 is an apocalyptic number.

997664502 is an abundant number, since it is smaller than the sum of its proper divisors (1119250698).

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

997664502 is a wasteful number, since it uses less digits than its factorization.

997664502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69060.

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 997664502 is about 31585.8275497097. The cubic root of 997664502 is about 999.2208938179.

The spelling of 997664502 in words is "nine hundred ninety-seven million, six hundred sixty-four thousand, five hundred two".