25440216 has 16 divisors (see below), whose sum is σ = 63600600. Its totient is φ = 8480064.

The previous prime is 25440199. The next prime is 25440229. The reversal of 25440216 is 61204452.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1060009 = 25440216 / (2 + 5 + 4 + 4 + 0 + 2 + 1 + 6).

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, 529981 + ... + 530028.

Almost surely, 2^25440216 is an apocalyptic number.

It is an amenable number.

25440216 is an abundant number, since it is smaller than the sum of its proper divisors (38160384).

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

25440216 is a wasteful number, since it uses less digits than its factorization.

25440216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060018 (or 1060014 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 25440216 is about 5043.8294975148. The cubic root of 25440216 is about 294.1080633803.

Adding to 25440216 its reverse (61204452), we get a palindrome (86644668).

It can be divided in two parts, 254 and 40216, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 25440216 in words is "twenty-five million, four hundred forty thousand, two hundred sixteen".