721620704 has 48 divisors (see below), whose sum is σ = 1658216448. Its totient is φ = 302681472.

The previous prime is 721620689. The next prime is 721620749. The reversal of 721620704 is 407026127.

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, 23744 + ... + 44799.

It is an arithmetic number, because the mean of its divisors is an integer number (34546176).

Almost surely, 2^721620704 is an apocalyptic number.

It is an amenable number.

721620704 is an abundant number, since it is smaller than the sum of its proper divisors (936595744).

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

721620704 is a wasteful number, since it uses less digits than its factorization.

721620704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68607 (or 68599 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 721620704 is about 26862.9987901574. The cubic root of 721620704 is about 896.9529481784.

The spelling of 721620704 in words is "seven hundred twenty-one million, six hundred twenty thousand, seven hundred four".