25556520 has 128 divisors (see below), whose sum is σ = 88128000. Its totient is φ = 5863680.

The previous prime is 25556513. The next prime is 25556527. The reversal of 25556520 is 2565552.

It is an interprime number because it is at equal distance from previous prime (25556513) and next prime (25556527).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (25556527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24571 + ... + 25589.

It is an arithmetic number, because the mean of its divisors is an integer number (688500).

Almost surely, 2^25556520 is an apocalyptic number.

25556520 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 25556520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44064000).

25556520 is an abundant number, since it is smaller than the sum of its proper divisors (62571480).

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

25556520 is a wasteful number, since it uses less digits than its factorization.

25556520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 25556520 is about 5055.3456855095. The cubic root of 25556520 is about 294.5555694106. Note that the first 4 decimals are identical.

The spelling of 25556520 in words is "twenty-five million, five hundred fifty-six thousand, five hundred twenty".