721439459476 has 12 divisors (see below), whose sum is σ = 1262530421460. Its totient is φ = 360716481920.

The previous prime is 721439459467. The next prime is 721439459563. The reversal of 721439459476 is 674954934127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 530313107076 + 191126352400 = 728226^2 + 437180^2 .

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, 272311 + ... + 1231678.

It is an arithmetic number, because the mean of its divisors is an integer number (105210868455).

Almost surely, 2^721439459476 is an apocalyptic number.

It is an amenable number.

721439459476 is a deficient number, since it is larger than the sum of its proper divisors (541090961984).

721439459476 is a wasteful number, since it uses less digits than its factorization.

721439459476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623914 (or 1623912 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 61.

The spelling of 721439459476 in words is "seven hundred twenty-one billion, four hundred thirty-nine million, four hundred fifty-nine thousand, four hundred seventy-six".