25656560 has 40 divisors (see below), whose sum is σ = 60505056. Its totient is φ = 10115840.

The previous prime is 25656559. The next prime is 25656581. The reversal of 25656560 is 6565652.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 25656560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3422 + ... + 7938.

Almost surely, 2^25656560 is an apocalyptic number.

25656560 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 25656560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30252528).

25656560 is an abundant number, since it is smaller than the sum of its proper divisors (34848496).

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

25656560 is a wasteful number, since it uses less digits than its factorization.

25656560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601 (or 4595 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 25656560 is about 5065.2304982103. The cubic root of 25656560 is about 294.9394110940.

The spelling of 25656560 in words is "twenty-five million, six hundred fifty-six thousand, five hundred sixty".