25631616 has 32 divisors (see below), whose sum is σ = 68085000. Its totient is φ = 8543744.

The previous prime is 25631611. The next prime is 25631623. The reversal of 25631616 is 61613652.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25631611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32991 + ... + 33758.

Almost surely, 2^25631616 is an apocalyptic number.

It is an amenable number.

25631616 is an abundant number, since it is smaller than the sum of its proper divisors (42453384).

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

25631616 is an equidigital number, since it uses as much as digits as its factorization.

25631616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66766 (or 66754 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 25631616 is about 5062.7676225559. The cubic root of 25631616 is about 294.8437974164.

The spelling of 25631616 in words is "twenty-five million, six hundred thirty-one thousand, six hundred sixteen".