25438656 has 56 divisors (see below), whose sum is σ = 68762880. Its totient is φ = 8296192.

The previous prime is 25438643. The next prime is 25438691. The reversal of 25438656 is 65683452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7615 + ... + 10433.

Almost surely, 2^25438656 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 25438656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34381440).

25438656 is an abundant number, since it is smaller than the sum of its proper divisors (43324224).

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

25438656 is a wasteful number, since it uses less digits than its factorization.

25438656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2871 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 25438656 is about 5043.6748507413. The cubic root of 25438656 is about 294.1020516656.

The spelling of 25438656 in words is "twenty-five million, four hundred thirty-eight thousand, six hundred fifty-six".