25995520 has 72 divisors (see below), whose sum is σ = 65048256. Its totient is φ = 9934848.

The previous prime is 25995511. The next prime is 25995523. The reversal of 25995520 is 2559952.

It is a self number, because there is not a number n which added to its sum of digits gives 25995520.

It is not an unprimeable number, because it can be changed into a prime (25995523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28999 + ... + 29881.

It is an arithmetic number, because the mean of its divisors is an integer number (903448).

Almost surely, 2^25995520 is an apocalyptic number.

25995520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

25995520 is the 2944-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25995520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32524128).

25995520 is an abundant number, since it is smaller than the sum of its proper divisors (39052736).

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

25995520 is an equidigital number, since it uses as much as digits as its factorization.

25995520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 913 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 37.

The square root of 25995520 is about 5098.5801945247. The cubic root of 25995520 is about 296.2325905013.

It can be divided in two parts, 25995 and 520, that multiplied together give a triangular number (13517400 = T₅₁₉₉).

The spelling of 25995520 in words is "twenty-five million, nine hundred ninety-five thousand, five hundred twenty".