25805520 has 160 divisors (see below), whose sum is σ = 95827200. Its totient is φ = 6345216.

The previous prime is 25805513. The next prime is 25805531. The reversal of 25805520 is 2550852.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27621 + ... + 28539.

It is an arithmetic number, because the mean of its divisors is an integer number (598920).

Almost surely, 2^25805520 is an apocalyptic number.

25805520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25805520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47913600).

25805520 is an abundant number, since it is smaller than the sum of its proper divisors (70021680).

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

25805520 is a wasteful number, since it uses less digits than its factorization.

25805520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 942 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 25805520 is about 5079.9133850884. The cubic root of 25805520 is about 295.5091084311.

It can be divided in two parts, 2580 and 5520, that added together give a square (8100 = 90²).

The spelling of 25805520 in words is "twenty-five million, eight hundred five thousand, five hundred twenty".