728311625 has 8 divisors (see below), whose sum is σ = 908933064. Its totient is φ = 582649200.

The previous prime is 728311607. The next prime is 728311669. The reversal of 728311625 is 526113827.

It is a happy number.

728311625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13456 + 728298169 = 116^2 + 26987^2 .

It is not a de Polignac number, because 728311625 - 2⁸ = 728311369 is a prime.

It is a super-2 number, since 2×728311625² = 1060875646220281250, which contains 22 as substring.

It is a Duffinian 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, 2913122 + ... + 2913371.

It is an arithmetic number, because the mean of its divisors is an integer number (113616633).

Almost surely, 2^728311625 is an apocalyptic number.

It is an amenable number.

728311625 is a deficient number, since it is larger than the sum of its proper divisors (180621439).

728311625 is an equidigital number, since it uses as much as digits as its factorization.

728311625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5826508 (or 5826498 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 728311625 is about 26987.2493040695. The cubic root of 728311625 is about 899.7166288950.

The spelling of 728311625 in words is "seven hundred twenty-eight million, three hundred eleven thousand, six hundred twenty-five".