25638425 has 6 divisors (see below), whose sum is σ = 31791678. Its totient is φ = 20510720.

The previous prime is 25638419. The next prime is 25638439. The reversal of 25638425 is 52483652.

It can be written as a sum of positive squares in 3 ways, for example, as 44944 + 25593481 = 212^2 + 5059^2 .

It is not a de Polignac number, because 25638425 - 2⁴ = 25638409 is a prime.

It is a super-3 number, since 3×25638425³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 512744 + ... + 512793.

It is an arithmetic number, because the mean of its divisors is an integer number (5298613).

Almost surely, 2^25638425 is an apocalyptic number.

25638425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25638425 is a deficient number, since it is larger than the sum of its proper divisors (6153253).

25638425 is a wasteful number, since it uses less digits than its factorization.

25638425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025547 (or 1025542 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 25638425 is about 5063.4400361809. The cubic root of 25638425 is about 294.8699033744.

The spelling of 25638425 in words is "twenty-five million, six hundred thirty-eight thousand, four hundred twenty-five".