721315304 has 16 divisors (see below), whose sum is σ = 1432023300. Its totient is φ = 339442432.

The previous prime is 721315291. The next prime is 721315327. The reversal of 721315304 is 403513127.

It can be written as a sum of positive squares in 2 ways, for example, as 619910404 + 101404900 = 24898^2 + 10070^2 .

It is a super-3 number, since 3×721315304³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651759 + ... + 2652030.

Almost surely, 2^721315304 is an apocalyptic number.

It is an amenable number.

721315304 is a deficient number, since it is larger than the sum of its proper divisors (710707996).

721315304 is a wasteful number, since it uses less digits than its factorization.

721315304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303812 (or 5303808 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 721315304 is about 26857.3137897296. The cubic root of 721315304 is about 896.8263959691.

The spelling of 721315304 in words is "seven hundred twenty-one million, three hundred fifteen thousand, three hundred four".