25687644 has 12 divisors (see below), whose sum is σ = 59937864. Its totient is φ = 8562544.

The previous prime is 25687631. The next prime is 25687661. The reversal of 25687644 is 44678652.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 25687596 and 25687605.

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, 1070307 + ... + 1070330.

It is an arithmetic number, because the mean of its divisors is an integer number (4994822).

Almost surely, 2^25687644 is an apocalyptic number.

It is an amenable number.

25687644 is an abundant number, since it is smaller than the sum of its proper divisors (34250220).

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

25687644 is a wasteful number, since it uses less digits than its factorization.

25687644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140644 (or 2140642 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 25687644 is about 5068.2979391508. The cubic root of 25687644 is about 295.0584735185.

The spelling of 25687644 in words is "twenty-five million, six hundred eighty-seven thousand, six hundred forty-four".