25338640 has 80 divisors (see below), whose sum is σ = 62995968. Its totient is φ = 9456128.

The previous prime is 25338637. The next prime is 25338661. The reversal of 25338640 is 4683352.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86334 + ... + 86626.

Almost surely, 2^25338640 is an apocalyptic number.

25338640 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 25338640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31497984).

25338640 is an abundant number, since it is smaller than the sum of its proper divisors (37657328).

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

25338640 is a wasteful number, since it uses less digits than its factorization.

25338640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 25338640 is about 5033.7500931214. The cubic root of 25338640 is about 293.7161095653.

The spelling of 25338640 in words is "twenty-five million, three hundred thirty-eight thousand, six hundred forty".