25170520 has 16 divisors (see below), whose sum is σ = 56633760. Its totient is φ = 10068192.

The previous prime is 25170517. The next prime is 25170547. The reversal of 25170520 is 2507152.

It is a junction number, because it is equal to n+sod(n) for n = 25170491 and 25170500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314592 + ... + 314671.

It is an arithmetic number, because the mean of its divisors is an integer number (3539610).

Almost surely, 2^25170520 is an apocalyptic number.

25170520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25170520 is an abundant number, since it is smaller than the sum of its proper divisors (31463240).

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

25170520 is a wasteful number, since it uses less digits than its factorization.

25170520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629274 (or 629270 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 25170520 is about 5017.0230216733. The cubic root of 25170520 is about 293.0650726960.

Adding to 25170520 its reverse (2507152), we get a palindrome (27677672).

The spelling of 25170520 in words is "twenty-five million, one hundred seventy thousand, five hundred twenty".