25615560 has 64 divisors (see below), whose sum is σ = 80196480. Its totient is φ = 6533120.

The previous prime is 25615559. The next prime is 25615561. The reversal of 25615560 is 6551652.

25615560 = 58² + 59² + ... + 425².

It is an interprime number because it is at equal distance from previous prime (25615559) and next prime (25615561).

It is a super-2 number, since 2×25615560² = 1312313828227200, which contains 22 as substring.

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 (25615561) 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, 1881 + ... + 7400.

It is an arithmetic number, because the mean of its divisors is an integer number (1253070).

Almost surely, 2^25615560 is an apocalyptic number.

25615560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25615560 is an abundant number, since it is smaller than the sum of its proper divisors (54580920).

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

25615560 is a wasteful number, since it uses less digits than its factorization.

25615560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9318 (or 9314 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 25615560 is about 5061.1816802008. The cubic root of 25615560 is about 294.7822198080.

The spelling of 25615560 in words is "twenty-five million, six hundred fifteen thousand, five hundred sixty".