722521920 has 56 divisors (see below), whose sum is σ = 2294010144. Its totient is φ = 192672256.

The previous prime is 722521883. The next prime is 722521939. The reversal of 722521920 is 29125227.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375354 + ... + 377273.

Almost surely, 2^722521920 is an apocalyptic number.

It is an amenable number.

722521920 is an abundant number, since it is smaller than the sum of its proper divisors (1571488224).

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

722521920 is a wasteful number, since it uses less digits than its factorization.

722521920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752647 (or 752637 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 722521920 is about 26879.7678561404. The cubic root of 722521920 is about 897.3261876875.

The spelling of 722521920 in words is "seven hundred twenty-two million, five hundred twenty-one thousand, nine hundred twenty".