25644216 has 32 divisors (see below), whose sum is σ = 69042960. Its totient is φ = 7890432.

The previous prime is 25644197. The next prime is 25644251. The reversal of 25644216 is 61244652.

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, 40785 + ... + 41408.

Almost surely, 2^25644216 is an apocalyptic number.

25644216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25644216 is an abundant number, since it is smaller than the sum of its proper divisors (43398744).

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

25644216 is a wasteful number, since it uses less digits than its factorization.

25644216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82215 (or 82211 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 25644216 is about 5064.0118483274. The cubic root of 25644216 is about 294.8921026457.

Adding to 25644216 its reverse (61244652), we get a palindrome (86888868).

The spelling of 25644216 in words is "twenty-five million, six hundred forty-four thousand, two hundred sixteen".