25515172 has 12 divisors (see below), whose sum is σ = 45601920. Its totient is φ = 12486056.

The previous prime is 25515167. The next prime is 25515173. The reversal of 25515172 is 27151552.

It is a self number, because there is not a number n which added to its sum of digits gives 25515172.

It is not an unprimeable number, because it can be changed into a prime (25515173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67672 + ... + 68047.

It is an arithmetic number, because the mean of its divisors is an integer number (3800160).

Almost surely, 2^25515172 is an apocalyptic number.

It is an amenable number.

25515172 is a deficient number, since it is larger than the sum of its proper divisors (20086748).

25515172 is a wasteful number, since it uses less digits than its factorization.

25515172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135770 (or 135768 counting only the distinct ones).

The product of its digits is 3500, while the sum is 28.

The square root of 25515172 is about 5051.2544976471. The cubic root of 25515172 is about 294.3966294362.

The spelling of 25515172 in words is "twenty-five million, five hundred fifteen thousand, one hundred seventy-two".