25640430 has 32 divisors (see below), whose sum is σ = 61768224. Its totient is φ = 6811776.

The previous prime is 25640429. The next prime is 25640453. The reversal of 25640430 is 3404652.

It is a self number, because there is not a number n which added to its sum of digits gives 25640430.

It is a congruent 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, 7332 + ... + 10248.

It is an arithmetic number, because the mean of its divisors is an integer number (1930257).

Almost surely, 2^25640430 is an apocalyptic number.

25640430 is an abundant number, since it is smaller than the sum of its proper divisors (36127794).

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

25640430 is a wasteful number, since it uses less digits than its factorization.

25640430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 25640430 is about 5063.6380202380. The cubic root of 25640430 is about 294.8775897376.

The spelling of 25640430 in words is "twenty-five million, six hundred forty thousand, four hundred thirty".