721340564 has 36 divisors (see below), whose sum is σ = 1472022720. Its totient is φ = 308392560.

The previous prime is 721340551. The next prime is 721340591. The reversal of 721340564 is 465043127.

It is a self number, because there is not a number n which added to its sum of digits gives 721340564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80207 + ... + 88745.

It is an arithmetic number, because the mean of its divisors is an integer number (40889520).

Almost surely, 2^721340564 is an apocalyptic number.

It is an amenable number.

721340564 is an abundant number, since it is smaller than the sum of its proper divisors (750682156).

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

721340564 is a wasteful number, since it uses less digits than its factorization.

721340564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8988 (or 8979 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 721340564 is about 26857.7840485771. The cubic root of 721340564 is about 896.8368646089.

The spelling of 721340564 in words is "seven hundred twenty-one million, three hundred forty thousand, five hundred sixty-four".