25990520 has 32 divisors (see below), whose sum is σ = 58626720. Its totient is φ = 10369920.

The previous prime is 25990519. The next prime is 25990543. The reversal of 25990520 is 2509952.

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, 25949 + ... + 26931.

It is an arithmetic number, because the mean of its divisors is an integer number (1832085).

Almost surely, 2^25990520 is an apocalyptic number.

25990520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25990520 is an abundant number, since it is smaller than the sum of its proper divisors (32636200).

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

25990520 is a wasteful number, since it uses less digits than its factorization.

25990520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 25990520 is about 5098.0898383610. The cubic root of 25990520 is about 296.2135967423.

The spelling of 25990520 in words is "twenty-five million, nine hundred ninety thousand, five hundred twenty".