721689072 has 40 divisors (see below), whose sum is σ = 2007777744. Its totient is φ = 222057984.

The previous prime is 721689047. The next prime is 721689113. The reversal of 721689072 is 270986127.

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, 577653 + ... + 578900.

Almost surely, 2^721689072 is an apocalyptic number.

It is an amenable number.

721689072 is an abundant number, since it is smaller than the sum of its proper divisors (1286088672).

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

721689072 is a wasteful number, since it uses less digits than its factorization.

721689072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156577 (or 1156571 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 721689072 is about 26864.2712910661. The cubic root of 721689072 is about 896.9812737435.

The spelling of 721689072 in words is "seven hundred twenty-one million, six hundred eighty-nine thousand, seventy-two".