25815825 has 72 divisors (see below), whose sum is σ = 54395328. Its totient is φ = 11456640.

The previous prime is 25815791. The next prime is 25815827. The reversal of 25815825 is 52851852.

25815825 is a `hidden beast` number, since 2 + 581 + 58 + 25 = 666.

It is not a de Polignac number, because 25815825 - 2⁶ = 25815761 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25815825.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25815827) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 58054 + ... + 58496.

Almost surely, 2^25815825 is an apocalyptic number.

25815825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25815825 is an abundant number, since it is smaller than the sum of its proper divisors (28579503).

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

25815825 is a wasteful number, since it uses less digits than its factorization.

25815825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 495 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The square root of 25815825 is about 5080.9275727961. The cubic root of 25815825 is about 295.5484387256.

The spelling of 25815825 in words is "twenty-five million, eight hundred fifteen thousand, eight hundred twenty-five".