25646530 has 32 divisors (see below), whose sum is σ = 56818944. Its totient is φ = 8116416.

The previous prime is 25646521. The next prime is 25646531. The reversal of 25646530 is 3564652.

It is a junction number, because it is equal to n+sod(n) for n = 25646492 and 25646501.

It is not an unprimeable number, because it can be changed into a prime (25646531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13182 + ... + 15001.

It is an arithmetic number, because the mean of its divisors is an integer number (1775592).

Almost surely, 2^25646530 is an apocalyptic number.

25646530 is an abundant number, since it is smaller than the sum of its proper divisors (31172414).

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

25646530 is a wasteful number, since it uses less digits than its factorization.

25646530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28210.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 25646530 is about 5064.2403181524. The cubic root of 25646530 is about 294.9009722195.

The spelling of 25646530 in words is "twenty-five million, six hundred forty-six thousand, five hundred thirty".