25687616 has 28 divisors (see below), whose sum is σ = 51942492. Its totient is φ = 12599808.

The previous prime is 25687609. The next prime is 25687621. The reversal of 25687616 is 61678652.

It can be written as a sum of positive squares in 2 ways, for example, as 23425600 + 2262016 = 4840^2 + 1504^2 .

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, 395 + ... + 7178.

It is an arithmetic number, because the mean of its divisors is an integer number (1855089).

Almost surely, 2^25687616 is an apocalyptic number.

It is an amenable number.

25687616 is an abundant number, since it is smaller than the sum of its proper divisors (26254876).

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

25687616 is an equidigital number, since it uses as much as digits as its factorization.

25687616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7638 (or 7628 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 25687616 is about 5068.2951768815. The cubic root of 25687616 is about 295.0583663121.

It can be divided in two parts, 256 and 87616, that multiplied together give a square (22429696 = 4736²).

The spelling of 25687616 in words is "twenty-five million, six hundred eighty-seven thousand, six hundred sixteen".