25224640 has 56 divisors (see below), whose sum is σ = 68653152. Its totient is φ = 8647680.

The previous prime is 25224637. The next prime is 25224691. The reversal of 25224640 is 4642252.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3391 + ... + 7870.

Almost surely, 2^25224640 is an apocalyptic number.

25224640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25224640 is an abundant number, since it is smaller than the sum of its proper divisors (43428512).

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

25224640 is a wasteful number, since it uses less digits than its factorization.

25224640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11285 (or 11275 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 25224640 is about 5022.4137623258. The cubic root of 25224640 is about 293.2749654298.

Adding to 25224640 its reverse (4642252), we get a palindrome (29866892).

The spelling of 25224640 in words is "twenty-five million, two hundred twenty-four thousand, six hundred forty".