25252640 has 72 divisors (see below), whose sum is σ = 69421212. Its totient is φ = 8655360.

The previous prime is 25252639. The next prime is 25252663. The reversal of 25252640 is 4625252.

It can be written as a sum of positive squares in 2 ways, for example, as 25120144 + 132496 = 5012^2 + 364^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6230 + ... + 9450.

Almost surely, 2^25252640 is an apocalyptic number.

25252640 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 25252640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34710606).

25252640 is an abundant number, since it is smaller than the sum of its proper divisors (44168572).

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

25252640 is a wasteful number, since it uses less digits than its factorization.

25252640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250 (or 3235 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25252640 is about 5025.2004935127. The cubic root of 25252640 is about 293.3834395581.

Adding to 25252640 its reverse (4625252), we get a palindrome (29877892).

The spelling of 25252640 in words is "twenty-five million, two hundred fifty-two thousand, six hundred forty".