664826976 has 72 divisors (see below), whose sum is σ = 2062484424. Its totient is φ = 201461760.

The previous prime is 664826971. The next prime is 664827011. The reversal of 664826976 is 679628466.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664826971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101761 + ... + 108096.

It is an arithmetic number, because the mean of its divisors is an integer number (28645617).

Almost surely, 2^664826976 is an apocalyptic number.

664826976 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

664826976 is an abundant number, since it is smaller than the sum of its proper divisors (1397657448).

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

664826976 is a wasteful number, since it uses less digits than its factorization.

664826976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209884 (or 209873 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 664826976 is about 25784.2389067430. The cubic root of 664826976 is about 872.7761655373.

The spelling of 664826976 in words is "six hundred sixty-four million, eight hundred twenty-six thousand, nine hundred seventy-six".