25698530 has 32 divisors (see below), whose sum is σ = 54347328. Its totient is φ = 8625600.

The previous prime is 25698487. The next prime is 25698551. The reversal of 25698530 is 3589652.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7556 + ... + 10415.

It is an arithmetic number, because the mean of its divisors is an integer number (1698354).

Almost surely, 2^25698530 is an apocalyptic number.

25698530 is an abundant number, since it is smaller than the sum of its proper divisors (28648798).

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

25698530 is a wasteful number, since it uses less digits than its factorization.

25698530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18002.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 25698530 is about 5069.3717559477. The cubic root of 25698530 is about 295.1001479375.

The spelling of 25698530 in words is "twenty-five million, six hundred ninety-eight thousand, five hundred thirty".