25440560 has 20 divisors (see below), whose sum is σ = 59149488. Its totient is φ = 10176192.

The previous prime is 25440557. The next prime is 25440581. The reversal of 25440560 is 6504452.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×25440560² = 1294444186227200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158924 + ... + 159083.

Almost surely, 2^25440560 is an apocalyptic number.

25440560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25440560 is an abundant number, since it is smaller than the sum of its proper divisors (33708928).

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

25440560 is a wasteful number, since it uses less digits than its factorization.

25440560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318020 (or 318014 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25440560 is about 5043.8635984729. The cubic root of 25440560 is about 294.1093890074.

The spelling of 25440560 in words is "twenty-five million, four hundred forty thousand, five hundred sixty".