25865520 has 40 divisors (see below), whose sum is σ = 80183856. Its totient is φ = 6897408.

The previous prime is 25865507. The next prime is 25865527. The reversal of 25865520 is 2556852.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (25865527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53647 + ... + 54126.

Almost surely, 2^25865520 is an apocalyptic number.

25865520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25865520 is an abundant number, since it is smaller than the sum of its proper divisors (54318336).

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

25865520 is a wasteful number, since it uses less digits than its factorization.

25865520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107789 (or 107783 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 25865520 is about 5085.8155688149. The cubic root of 25865520 is about 295.7379589840.

The spelling of 25865520 in words is "twenty-five million, eight hundred sixty-five thousand, five hundred twenty".