727625721 has 16 divisors (see below), whose sum is σ = 1028429568. Its totient is φ = 456019200.

The previous prime is 727625713. The next prime is 727625749. The reversal of 727625721 is 127526727.

It is not a de Polignac number, because 727625721 - 2³ = 727625713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 727625721.

It is not an unprimeable number, because it can be changed into a prime (727625761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38631 + ... + 54291.

It is an arithmetic number, because the mean of its divisors is an integer number (64276848).

Almost surely, 2^727625721 is an apocalyptic number.

It is an amenable number.

727625721 is a deficient number, since it is larger than the sum of its proper divisors (300803847).

727625721 is a wasteful number, since it uses less digits than its factorization.

727625721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16592.

The product of its digits is 82320, while the sum is 39.

The square root of 727625721 is about 26974.5383834460. The cubic root of 727625721 is about 899.4340973323.

The spelling of 727625721 in words is "seven hundred twenty-seven million, six hundred twenty-five thousand, seven hundred twenty-one".