721970872 has 16 divisors (see below), whose sum is σ = 1547080560. Its totient is φ = 309416064.

The previous prime is 721970869. The next prime is 721970923. The reversal of 721970872 is 278079127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6446113 + ... + 6446224.

It is an arithmetic number, because the mean of its divisors is an integer number (96692535).

Almost surely, 2^721970872 is an apocalyptic number.

It is an amenable number.

721970872 is an abundant number, since it is smaller than the sum of its proper divisors (825109688).

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

721970872 is a wasteful number, since it uses less digits than its factorization.

721970872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12892350 (or 12892346 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 721970872 is about 26869.5156636661. The cubic root of 721970872 is about 897.0980075004.

The spelling of 721970872 in words is "seven hundred twenty-one million, nine hundred seventy thousand, eight hundred seventy-two".