25906816 has 32 divisors (see below), whose sum is σ = 55584900. Its totient is φ = 11956224.

The previous prime is 25906799. The next prime is 25906843. The reversal of 25906816 is 61860952.

It can be written as a sum of positive squares in 2 ways, for example, as 24206400 + 1700416 = 4920^2 + 1304^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 6121 + ... + 9448.

Almost surely, 2^25906816 is an apocalyptic number.

25906816 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25906816 is an abundant number, since it is smaller than the sum of its proper divisors (29678084).

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

25906816 is a wasteful number, since it uses less digits than its factorization.

25906816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15596 (or 15584 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 25906816 is about 5089.8738687712. The cubic root of 25906816 is about 295.8952636507.

The spelling of 25906816 in words is "twenty-five million, nine hundred six thousand, eight hundred sixteen".