25131728 has 20 divisors (see below), whose sum is σ = 49380768. Its totient is φ = 12388320.

The previous prime is 25131713. The next prime is 25131739. The reversal of 25131728 is 82713152.

It is a self number, because there is not a number n which added to its sum of digits gives 25131728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9926 + ... + 12197.

Almost surely, 2^25131728 is an apocalyptic number.

It is an amenable number.

25131728 is a deficient number, since it is larger than the sum of its proper divisors (24249040).

25131728 is a wasteful number, since it uses less digits than its factorization.

25131728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22202 (or 22196 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 25131728 is about 5013.1554932996. The cubic root of 25131728 is about 292.9144411158.

It can be divided in two parts, 251317 and 28, that multiplied together give a triangular number (7036876 = T₃₇₅₁).

The spelling of 25131728 in words is "twenty-five million, one hundred thirty-one thousand, seven hundred twenty-eight".