25638140 has 24 divisors (see below), whose sum is σ = 58735152. Its totient is φ = 9322880.

The previous prime is 25638103. The next prime is 25638181. The reversal of 25638140 is 4183652.

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, 58049 + ... + 58488.

It is an arithmetic number, because the mean of its divisors is an integer number (2447298).

Almost surely, 2^25638140 is an apocalyptic number.

25638140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25638140 is an abundant number, since it is smaller than the sum of its proper divisors (33097012).

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

25638140 is a wasteful number, since it uses less digits than its factorization.

25638140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116557 (or 116555 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 25638140 is about 5063.4118931803. The cubic root of 25638140 is about 294.8688107665.

The spelling of 25638140 in words is "twenty-five million, six hundred thirty-eight thousand, one hundred forty".