25693638 has 8 divisors (see below), whose sum is σ = 51387288. Its totient is φ = 8564544.

The previous prime is 25693597. The next prime is 25693639. The reversal of 25693638 is 83639652.

It is a sphenic number, since it is the product of 3 distinct primes.

25693638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 25693638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25693639) 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, 2141131 + ... + 2141142.

It is an arithmetic number, because the mean of its divisors is an integer number (6423411).

Almost surely, 2^25693638 is an apocalyptic number.

25693638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25693638 is a wasteful number, since it uses less digits than its factorization.

25693638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282278.

The product of its digits is 233280, while the sum is 42.

The square root of 25693638 is about 5068.8892274343. The cubic root of 25693638 is about 295.0814215546.

The spelling of 25693638 in words is "twenty-five million, six hundred ninety-three thousand, six hundred thirty-eight".