25400656 has 40 divisors (see below), whose sum is σ = 51496704. Its totient is φ = 12122880.

The previous prime is 25400651. The next prime is 25400693. The reversal of 25400656 is 65600452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40860 + ... + 41476.

Almost surely, 2^25400656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25400656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25748352).

25400656 is an abundant number, since it is smaller than the sum of its proper divisors (26096048).

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

25400656 is a wasteful number, since it uses less digits than its factorization.

25400656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 25400656 is about 5039.9063483362. The cubic root of 25400656 is about 293.9555364909.

Subtracting from 25400656 its sum of digits (28), we obtain a triangular number (25400628 = T₇₁₂₇).

The spelling of 25400656 in words is "twenty-five million, four hundred thousand, six hundred fifty-six".