721055972 has 48 divisors (see below), whose sum is σ = 1584777600. Its totient is φ = 285245856.

The previous prime is 721055953. The next prime is 721056041. The reversal of 721055972 is 279550127.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2378 + ... + 38049.

It is an arithmetic number, because the mean of its divisors is an integer number (33016200).

Almost surely, 2^721055972 is an apocalyptic number.

It is an amenable number.

721055972 is an abundant number, since it is smaller than the sum of its proper divisors (863721628).

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

721055972 is a wasteful number, since it uses less digits than its factorization.

721055972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40465 (or 40449 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 721055972 is about 26852.4853970727. The cubic root of 721055972 is about 896.7189054539.

The spelling of 721055972 in words is "seven hundred twenty-one million, fifty-five thousand, nine hundred seventy-two".