664979076 has 18 divisors (see below), whose sum is σ = 1680919422. Its totient is φ = 221659680.

The previous prime is 664979071. The next prime is 664979083. The reversal of 664979076 is 670979466.

664979076 is a `hidden beast` number, since 66 + 497 + 90 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 416160000 + 248819076 = 20400^2 + 15774^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (664979071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9235785 + ... + 9235856.

Almost surely, 2^664979076 is an apocalyptic number.

It is an amenable number.

664979076 is an abundant number, since it is smaller than the sum of its proper divisors (1015940346).

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

664979076 is a wasteful number, since it uses less digits than its factorization.

664979076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18471651 (or 18471646 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The square root of 664979076 is about 25787.1882143052. The cubic root of 664979076 is about 872.8427187596.

The spelling of 664979076 in words is "six hundred sixty-four million, nine hundred seventy-nine thousand, seventy-six".