725631530 has 64 divisors (see below), whose sum is σ = 1455300000. Its totient is φ = 258785280.

The previous prime is 725631509. The next prime is 725631547. The reversal of 725631530 is 35136527.

It can be written as a sum of positive squares in 16 ways, for example, as 7230721 + 718400809 = 2689^2 + 26803^2 .

It is a super-2 number, since 2×725631530² = 1053082234660281800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 580346 + ... + 581594.

Almost surely, 2^725631530 is an apocalyptic number.

725631530 is an abundant number, since it is smaller than the sum of its proper divisors (729668470).

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

725631530 is a wasteful number, since it uses less digits than its factorization.

725631530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419.

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 725631530 is about 26937.5487006520. The cubic root of 725631530 is about 898.6116577951.

The spelling of 725631530 in words is "seven hundred twenty-five million, six hundred thirty-one thousand, five hundred thirty".