721516732 has 12 divisors (see below), whose sum is σ = 1262997736. Its totient is φ = 360660240.

The previous prime is 721516711. The next prime is 721516777. The reversal of 721516732 is 237615127.

It is a congruent number.

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, 6519 + ... + 38542.

Almost surely, 2^721516732 is an apocalyptic number.

It is an amenable number.

721516732 is a deficient number, since it is larger than the sum of its proper divisors (541481004).

721516732 is a wasteful number, since it uses less digits than its factorization.

721516732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49068 (or 49066 counting only the distinct ones).

The product of its digits is 17640, while the sum is 34.

The square root of 721516732 is about 26861.0634934658. The cubic root of 721516732 is about 896.9098680807.

The spelling of 721516732 in words is "seven hundred twenty-one million, five hundred sixteen thousand, seven hundred thirty-two".