672664864 has 12 divisors (see below), whose sum is σ = 1324309014. Its totient is φ = 336332416.

The previous prime is 672664859. The next prime is 672664903. The reversal of 672664864 is 468466276.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 388405264 + 284259600 = 19708^2 + 16860^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510357 + ... + 10510420.

Almost surely, 2^672664864 is an apocalyptic number.

It is an amenable number.

672664864 is a deficient number, since it is larger than the sum of its proper divisors (651644150).

672664864 is a wasteful number, since it uses less digits than its factorization.

672664864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21020787 (or 21020779 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 49.

The square root of 672664864 is about 25935.7834660918. The cubic root of 672664864 is about 876.1926002844.

The spelling of 672664864 in words is "six hundred seventy-two million, six hundred sixty-four thousand, eight hundred sixty-four".