25288638 has 64 divisors (see below), whose sum is σ = 55987200. Its totient is φ = 7589120.

The previous prime is 25288631. The next prime is 25288651. The reversal of 25288638 is 83688252.

It is a self number, because there is not a number n which added to its sum of digits gives 25288638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25288631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284098 + ... + 284186.

It is an arithmetic number, because the mean of its divisors is an integer number (874800).

Almost surely, 2^25288638 is an apocalyptic number.

25288638 is an abundant number, since it is smaller than the sum of its proper divisors (30698562).

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

25288638 is a wasteful number, since it uses less digits than its factorization.

25288638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217.

The product of its digits is 184320, while the sum is 42.

The square root of 25288638 is about 5028.7809656019. The cubic root of 25288638 is about 293.5227807997.

The spelling of 25288638 in words is "twenty-five million, two hundred eighty-eight thousand, six hundred thirty-eight".