25638756 has 96 divisors (see below), whose sum is σ = 71651328. Its totient is φ = 7032960.

The previous prime is 25638751. The next prime is 25638757. The reversal of 25638756 is 65783652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25638751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114861 + ... + 115083.

It is an arithmetic number, because the mean of its divisors is an integer number (746368).

Almost surely, 2^25638756 is an apocalyptic number.

25638756 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25638756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35825664).

25638756 is an abundant number, since it is smaller than the sum of its proper divisors (46012572).

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

25638756 is a wasteful number, since it uses less digits than its factorization.

25638756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 319 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 25638756 is about 5063.4727213643. The cubic root of 25638756 is about 294.8711723228.

Subtracting 25638756 from its reverse (65783652), we obtain a square (40144896 = 6336²).

The spelling of 25638756 in words is "twenty-five million, six hundred thirty-eight thousand, seven hundred fifty-six".