25606656 has 60 divisors (see below), whose sum is σ = 73915842. Its totient is φ = 8534016.

The previous prime is 25606639. The next prime is 25606667. The reversal of 25606656 is 65660652.

It can be written as a sum of positive squares in only one way, i.e., 15872256 + 9734400 = 3984^2 + 3120^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 25606656.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1830 + ... + 7386.

Almost surely, 2^25606656 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 25606656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36957921).

25606656 is an abundant number, since it is smaller than the sum of its proper divisors (48309186).

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

25606656 is an equidigital number, since it uses as much as digits as its factorization.

25606656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5581 (or 5562 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 25606656 is about 5060.3019672743. The cubic root of 25606656 is about 294.7480602962.

It can be divided in two parts, 25606 and 656, that added together give a palindrome (26262).

The spelling of 25606656 in words is "twenty-five million, six hundred six thousand, six hundred fifty-six".