25318530 has 24 divisors (see below), whose sum is σ = 65828412. Its totient is φ = 6751584.

The previous prime is 25318511. The next prime is 25318543. The reversal of 25318530 is 3581352.

It can be written as a sum of positive squares in 2 ways, for example, as 25310961 + 7569 = 5031^2 + 87^2 .

It is a super-2 number, since 2×25318530² = 1282055922721800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25318494 and 25318503.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140569 + ... + 140748.

Almost surely, 2^25318530 is an apocalyptic number.

25318530 is an abundant number, since it is smaller than the sum of its proper divisors (40509882).

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

25318530 is a wasteful number, since it uses less digits than its factorization.

25318530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281330 (or 281327 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 25318530 is about 5031.7521799071. The cubic root of 25318530 is about 293.6383864482.

Adding to 25318530 its reverse (3581352), we get a palindrome (28899882).

The spelling of 25318530 in words is "twenty-five million, three hundred eighteen thousand, five hundred thirty".