25605636 has 48 divisors (see below), whose sum is σ = 69686400. Its totient is φ = 7314720.

The previous prime is 25605589. The next prime is 25605649. The reversal of 25605636 is 63650652.

It is a junction number, because it is equal to n+sod(n) for n = 25605597 and 25605606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1006 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (1451800).

Almost surely, 2^25605636 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 25605636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34843200).

25605636 is an abundant number, since it is smaller than the sum of its proper divisors (44080764).

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

25605636 is a wasteful number, since it uses less digits than its factorization.

25605636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249 (or 6233 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 25605636 is about 5060.2011817713. The cubic root of 25605636 is about 294.7441466391.

The spelling of 25605636 in words is "twenty-five million, six hundred five thousand, six hundred thirty-six".