25525840 has 60 divisors (see below), whose sum is σ = 63300636. Its totient is φ = 9539584.

The previous prime is 25525817. The next prime is 25525847. The reversal of 25525840 is 4852552.

It can be written as a sum of positive squares in 6 ways, for example, as 685584 + 24840256 = 828^2 + 4984^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25525847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186252 + ... + 186388.

Almost surely, 2^25525840 is an apocalyptic number.

25525840 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 25525840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31650318).

25525840 is an abundant number, since it is smaller than the sum of its proper divisors (37774796).

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

25525840 is a wasteful number, since it uses less digits than its factorization.

25525840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 25525840 is about 5052.3103625965. The cubic root of 25525840 is about 294.4376532062.

The spelling of 25525840 in words is "twenty-five million, five hundred twenty-five thousand, eight hundred forty".