64977960 has 32 divisors (see below), whose sum is σ = 194934240. Its totient is φ = 17327424.

The previous prime is 64977943. The next prime is 64977977. The reversal of 64977960 is 6977946.

It is an interprime number because it is at equal distance from previous prime (64977943) and next prime (64977977).

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, 270622 + ... + 270861.

It is an arithmetic number, because the mean of its divisors is an integer number (6091695).

Almost surely, 2^64977960 is an apocalyptic number.

64977960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64977960 is an abundant number, since it is smaller than the sum of its proper divisors (129956280).

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

64977960 is a wasteful number, since it uses less digits than its factorization.

64977960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541497 (or 541493 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 64977960 is about 8060.8907696358. The cubic root of 64977960 is about 402.0271262109.

The spelling of 64977960 in words is "sixty-four million, nine hundred seventy-seven thousand, nine hundred sixty".