664728476 has 12 divisors (see below), whose sum is σ = 1163972208. Its totient is φ = 332164992.

The previous prime is 664728469. The next prime is 664728481. The reversal of 664728476 is 674827466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42176 + ... + 55751.

It is an arithmetic number, because the mean of its divisors is an integer number (96997684).

Almost surely, 2^664728476 is an apocalyptic number.

It is an amenable number.

664728476 is a deficient number, since it is larger than the sum of its proper divisors (499243732).

664728476 is a wasteful number, since it uses less digits than its factorization.

664728476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99628 (or 99626 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 50.

The square root of 664728476 is about 25782.3287544008. The cubic root of 664728476 is about 872.7330602376.

The spelling of 664728476 in words is "six hundred sixty-four million, seven hundred twenty-eight thousand, four hundred seventy-six".