64690979 has 6 divisors (see below), whose sum is σ = 65675484. Its totient is φ = 63721020.

The previous prime is 64690961. The next prime is 64690993. The reversal of 64690979 is 97909646.

It is a de Polignac number, because none of the positive numbers 2^k-64690979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64690939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2717 + ... + 11694.

It is an arithmetic number, because the mean of its divisors is an integer number (10945914).

Almost surely, 2^64690979 is an apocalyptic number.

64690979 is a deficient number, since it is larger than the sum of its proper divisors (984505).

64690979 is an equidigital number, since it uses as much as digits as its factorization.

64690979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14545 (or 14478 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 64690979 is about 8043.0702471133. The cubic root of 64690979 is about 401.4343897501.

The spelling of 64690979 in words is "sixty-four million, six hundred ninety thousand, nine hundred seventy-nine".