25456656 has 80 divisors (see below), whose sum is σ = 70154240. Its totient is φ = 7931520.

The previous prime is 25456649. The next prime is 25456661. The reversal of 25456656 is 65665452.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93801 + ... + 94071.

It is an arithmetic number, because the mean of its divisors is an integer number (876928).

Almost surely, 2^25456656 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 25456656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35077120).

25456656 is an abundant number, since it is smaller than the sum of its proper divisors (44697584).

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

25456656 is a wasteful number, since it uses less digits than its factorization.

25456656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 398 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

The square root of 25456656 is about 5045.4589484010. The cubic root of 25456656 is about 294.1714026671.

The spelling of 25456656 in words is "twenty-five million, four hundred fifty-six thousand, six hundred fifty-six".