720973856 has 24 divisors (see below), whose sum is σ = 1436523984. Its totient is φ = 356142400.

The previous prime is 720973849. The next prime is 720973919. The reversal of 720973856 is 658379027.

It is a self number, because there is not a number n which added to its sum of digits gives 720973856.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133070 + ... + 138381.

It is an arithmetic number, because the mean of its divisors is an integer number (59855166).

Almost surely, 2^720973856 is an apocalyptic number.

It is an amenable number.

720973856 is a deficient number, since it is larger than the sum of its proper divisors (715550128).

720973856 is a wasteful number, since it uses less digits than its factorization.

720973856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271544 (or 271536 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 720973856 is about 26850.9563330620. The cubic root of 720973856 is about 896.6848638224.

The spelling of 720973856 in words is "seven hundred twenty million, nine hundred seventy-three thousand, eight hundred fifty-six".