25640329 has 16 divisors (see below), whose sum is σ = 31711680. Its totient is φ = 20381760.

The previous prime is 25640311. The next prime is 25640339. The reversal of 25640329 is 92304652.

It is a cyclic number.

It is not a de Polignac number, because 25640329 - 2⁷ = 25640201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25640329.

It is not an unprimeable number, because it can be changed into a prime (25640309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2002 + ... + 7435.

It is an arithmetic number, because the mean of its divisors is an integer number (1981980).

Almost surely, 2^25640329 is an apocalyptic number.

It is an amenable number.

25640329 is a deficient number, since it is larger than the sum of its proper divisors (6071351).

25640329 is a wasteful number, since it uses less digits than its factorization.

25640329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 25640329 is about 5063.6280471614. The cubic root of 25640329 is about 294.8772025539.

The spelling of 25640329 in words is "twenty-five million, six hundred forty thousand, three hundred twenty-nine".