721713444 has 24 divisors (see below), whose sum is σ = 1783057248. Its totient is φ = 226419840.

The previous prime is 721713439. The next prime is 721713451. The reversal of 721713444 is 444317127.

It is a super-2 number, since 2×721713444² = 1041740590500682272, which contains 22 as substring.

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, 1768702 + ... + 1769109.

It is an arithmetic number, because the mean of its divisors is an integer number (74294052).

Almost surely, 2^721713444 is an apocalyptic number.

It is an amenable number.

721713444 is an abundant number, since it is smaller than the sum of its proper divisors (1061343804).

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

721713444 is a wasteful number, since it uses less digits than its factorization.

721713444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537835 (or 3537833 counting only the distinct ones).

The product of its digits is 18816, while the sum is 33.

The square root of 721713444 is about 26864.7249008807. The cubic root of 721713444 is about 896.9913708810.

The spelling of 721713444 in words is "seven hundred twenty-one million, seven hundred thirteen thousand, four hundred forty-four".