25320636 has 72 divisors (see below), whose sum is σ = 71495424. Its totient is φ = 7489440.

The previous prime is 25320623. The next prime is 25320637. The reversal of 25320636 is 63602352.

25320636 is a `hidden beast` number, since 2 + 5 + 3 + 20 + 636 = 666.

It is a super-2 number, since 2×25320636² = 1282269214888992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25320637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16285 + ... + 17771.

It is an arithmetic number, because the mean of its divisors is an integer number (992992).

Almost surely, 2^25320636 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 25320636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35747712).

25320636 is an abundant number, since it is smaller than the sum of its proper divisors (46174788).

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

25320636 is a wasteful number, since it uses less digits than its factorization.

25320636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 25320636 is about 5031.9614465932. The cubic root of 25320636 is about 293.6465278542.

Adding to 25320636 its reverse (63602352), we get a palindrome (88922988).

The spelling of 25320636 in words is "twenty-five million, three hundred twenty thousand, six hundred thirty-six".