25590816 has 84 divisors (see below), whose sum is σ = 75607182. Its totient is φ = 8522496.

The previous prime is 25590787. The next prime is 25590821. The reversal of 25590816 is 61809552.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23619600 + 1971216 = 4860^2 + 1404^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 22780 + ... + 23876.

Almost surely, 2^25590816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25590816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37803591).

25590816 is an abundant number, since it is smaller than the sum of its proper divisors (50016366).

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

25590816 is an equidigital number, since it uses as much as digits as its factorization.

25590816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 25590816 is about 5058.7366011683. The cubic root of 25590816 is about 294.6872717745.

The spelling of 25590816 in words is "twenty-five million, five hundred ninety thousand, eight hundred sixteen".