25638720 has 112 divisors (see below), whose sum is σ = 86246208. Its totient is φ = 6430720.

The previous prime is 25638713. The next prime is 25638751. The reversal of 25638720 is 2783652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15535 + ... + 17105.

Almost surely, 2^25638720 is an apocalyptic number.

25638720 is a gapful number since it is divisible by the number (20) 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 25638720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43123104).

25638720 is an abundant number, since it is smaller than the sum of its proper divisors (60607488).

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

25638720 is a wasteful number, since it uses less digits than its factorization.

25638720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 1598 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 25638720 is about 5063.4691664905. The cubic root of 25638720 is about 294.8710343108.

The spelling of 25638720 in words is "twenty-five million, six hundred thirty-eight thousand, seven hundred twenty".