64977930 has 32 divisors (see below), whose sum is σ = 173275200. Its totient is φ = 17327376.

The previous prime is 64977919. The next prime is 64977931. The reversal of 64977930 is 3977946.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (64977931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120060 + ... + 120599.

It is an arithmetic number, because the mean of its divisors is an integer number (5414850).

Almost surely, 2^64977930 is an apocalyptic number.

64977930 is an abundant number, since it is smaller than the sum of its proper divisors (108297270).

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

64977930 is a wasteful number, since it uses less digits than its factorization.

64977930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240675 (or 240669 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 64977930 is about 8060.8889087991. Note that the first 3 decimals coincide. The cubic root of 64977930 is about 402.0270643396.

The spelling of 64977930 in words is "sixty-four million, nine hundred seventy-seven thousand, nine hundred thirty".