25515860 has 48 divisors (see below), whose sum is σ = 57153600. Its totient is φ = 9540864.

The previous prime is 25515823. The next prime is 25515863. The reversal of 25515860 is 6851552.

It is a super-2 number, since 2×25515860² = 1302118223079200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25515863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31136 + ... + 31944.

It is an arithmetic number, because the mean of its divisors is an integer number (1190700).

Almost surely, 2^25515860 is an apocalyptic number.

25515860 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 25515860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28576800).

25515860 is an abundant number, since it is smaller than the sum of its proper divisors (31637740).

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

25515860 is a wasteful number, since it uses less digits than its factorization.

25515860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 25515860 is about 5051.3225990823. The cubic root of 25515860 is about 294.3992754836.

The spelling of 25515860 in words is "twenty-five million, five hundred fifteen thousand, eight hundred sixty".