25285840 has 20 divisors (see below), whose sum is σ = 58789764. Its totient is φ = 10114304.

The previous prime is 25285831. The next prime is 25285891. The reversal of 25285840 is 4858252.

It can be written as a sum of positive squares in 2 ways, for example, as 2742336 + 22543504 = 1656^2 + 4748^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 25285796 and 25285805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157957 + ... + 158116.

Almost surely, 2^25285840 is an apocalyptic number.

25285840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25285840 is an abundant number, since it is smaller than the sum of its proper divisors (33503924).

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

25285840 is a wasteful number, since it uses less digits than its factorization.

25285840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316086 (or 316080 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 25285840 is about 5028.5027592714. The cubic root of 25285840 is about 293.5119550285.

The spelling of 25285840 in words is "twenty-five million, two hundred eighty-five thousand, eight hundred forty".