25542636 has 96 divisors (see below), whose sum is σ = 74575872. Its totient is φ = 6635520.

The previous prime is 25542613. The next prime is 25542641. The reversal of 25542636 is 63624552.

It is a junction number, because it is equal to n+sod(n) for n = 25542597 and 25542606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43980 + ... + 44556.

It is an arithmetic number, because the mean of its divisors is an integer number (776832).

Almost surely, 2^25542636 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 25542636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37287936).

25542636 is an abundant number, since it is smaller than the sum of its proper divisors (49033236).

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

25542636 is a wasteful number, since it uses less digits than its factorization.

25542636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 637 counting only the distinct ones).

The product of its digits is 43200, while the sum is 33.

The square root of 25542636 is about 5053.9722990931. The cubic root of 25542636 is about 294.5022190283.

The spelling of 25542636 in words is "twenty-five million, five hundred forty-two thousand, six hundred thirty-six".