25315638 has 16 divisors (see below), whose sum is σ = 53296320. Its totient is φ = 7994376.

The previous prime is 25315627. The next prime is 25315643. The reversal of 25315638 is 83651352.

It is a junction number, because it is equal to n+sod(n) for n = 25315599 and 25315608.

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, 110920 + ... + 111147.

It is an arithmetic number, because the mean of its divisors is an integer number (3331020).

Almost surely, 2^25315638 is an apocalyptic number.

25315638 is an abundant number, since it is smaller than the sum of its proper divisors (27980682).

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

25315638 is a wasteful number, since it uses less digits than its factorization.

25315638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222091.

The product of its digits is 21600, while the sum is 33.

The square root of 25315638 is about 5031.4647966571. The cubic root of 25315638 is about 293.6272057761.

The spelling of 25315638 in words is "twenty-five million, three hundred fifteen thousand, six hundred thirty-eight".