25225640 has 32 divisors (see below), whose sum is σ = 61918560. Its totient is φ = 9172800.

The previous prime is 25225633. The next prime is 25225643. The reversal of 25225640 is 4652252.

It is not an unprimeable number, because it can be changed into a prime (25225643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28226 + ... + 29105.

It is an arithmetic number, because the mean of its divisors is an integer number (1934955).

Almost surely, 2^25225640 is an apocalyptic number.

25225640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25225640 is an abundant number, since it is smaller than the sum of its proper divisors (36692920).

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

25225640 is a wasteful number, since it uses less digits than its factorization.

25225640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57353 (or 57349 counting only the distinct ones).

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

The square root of 25225640 is about 5022.5133150645. The cubic root of 25225640 is about 293.2788408877.

Adding to 25225640 its reverse (4652252), we get a palindrome (29877892).

The spelling of 25225640 in words is "twenty-five million, two hundred twenty-five thousand, six hundred forty".