64977392 has 40 divisors (see below), whose sum is σ = 132018336. Its totient is φ = 30922496.

The previous prime is 64977389. The next prime is 64977427. The reversal of 64977392 is 29377946.

It is a super-2 number, since 2×64977392² = 8444122942243328, which contains 22 as substring.

It is a congruent number.

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, 116378 + ... + 116934.

Almost surely, 2^64977392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64977392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66009168).

64977392 is an abundant number, since it is smaller than the sum of its proper divisors (67040944).

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

64977392 is a wasteful number, since it uses less digits than its factorization.

64977392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 899 counting only the distinct ones).

The product of its digits is 571536, while the sum is 47.

The square root of 64977392 is about 8060.8555377205. The cubic root of 64977392 is about 402.0259547774.

The spelling of 64977392 in words is "sixty-four million, nine hundred seventy-seven thousand, three hundred ninety-two".