725523538 has 4 divisors (see below), whose sum is σ = 1088285310. Its totient is φ = 362761768.

The previous prime is 725523527. The next prime is 725523551. The reversal of 725523538 is 835325527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835325527 = 53 ⋅15760859.

It can be written as a sum of positive squares in only one way, i.e., 690796089 + 34727449 = 26283^2 + 5893^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 725523538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181380883 + ... + 181380886.

Almost surely, 2^725523538 is an apocalyptic number.

725523538 is a deficient number, since it is larger than the sum of its proper divisors (362761772).

725523538 is a wasteful number, since it uses less digits than its factorization.

725523538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362761771.

The product of its digits is 252000, while the sum is 40.

The square root of 725523538 is about 26935.5441378117. The cubic root of 725523538 is about 898.5670770032.

The spelling of 725523538 in words is "seven hundred twenty-five million, five hundred twenty-three thousand, five hundred thirty-eight".