25640384 has 112 divisors (see below), whose sum is σ = 65446656. Its totient is φ = 9757440.

The previous prime is 25640383. The next prime is 25640399. The reversal of 25640384 is 48304652.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 25640384.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596267 + ... + 596309.

Almost surely, 2^25640384 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 25640384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32723328).

25640384 is an abundant number, since it is smaller than the sum of its proper divisors (39806272).

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

25640384 is an equidigital number, since it uses as much as digits as its factorization.

25640384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 25640384 is about 5063.6334780472. The cubic root of 25640384 is about 294.8774133966.

The spelling of 25640384 in words is "twenty-five million, six hundred forty thousand, three hundred eighty-four".