64501979 has 16 divisors (see below), whose sum is σ = 71823360. Its totient is φ = 57672000.

The previous prime is 64501973. The next prime is 64502023. The reversal of 64501979 is 97910546.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64501979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64501973) 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, 22814 + ... + 25484.

It is an arithmetic number, because the mean of its divisors is an integer number (4488960).

Almost surely, 2^64501979 is an apocalyptic number.

64501979 is a deficient number, since it is larger than the sum of its proper divisors (7321381).

64501979 is a wasteful number, since it uses less digits than its factorization.

64501979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 64501979 is about 8031.3124083178. The cubic root of 64501979 is about 401.0430672459.

The spelling of 64501979 in words is "sixty-four million, five hundred one thousand, nine hundred seventy-nine".