25128920 has 32 divisors (see below), whose sum is σ = 58071600. Its totient is φ = 9779328.

The previous prime is 25128919. The next prime is 25128931. The reversal of 25128920 is 2982152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7010 + ... + 9969.

Almost surely, 2^25128920 is an apocalyptic number.

25128920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25128920 is an abundant number, since it is smaller than the sum of its proper divisors (32942680).

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

25128920 is a wasteful number, since it uses less digits than its factorization.

25128920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17027 (or 17023 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 25128920 is about 5012.8754223499. The cubic root of 25128920 is about 292.9035314749.

The spelling of 25128920 in words is "twenty-five million, one hundred twenty-eight thousand, nine hundred twenty".