724520728 has 8 divisors (see below), whose sum is σ = 1358476380. Its totient is φ = 362260360.

The previous prime is 724520701. The next prime is 724520761. The reversal of 724520728 is 827025427.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45282538 + ... + 45282553.

Almost surely, 2^724520728 is an apocalyptic number.

It is an amenable number.

724520728 is a deficient number, since it is larger than the sum of its proper divisors (633955652).

724520728 is a wasteful number, since it uses less digits than its factorization.

724520728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90565097 (or 90565093 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 724520728 is about 26916.9227067286. The cubic root of 724520728 is about 898.1528898763.

The spelling of 724520728 in words is "seven hundred twenty-four million, five hundred twenty thousand, seven hundred twenty-eight".