25640317 has 8 divisors (see below), whose sum is σ = 26593280. Its totient is φ = 24695280.

The previous prime is 25640311. The next prime is 25640339. The reversal of 25640317 is 71304652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25640317 - 2³ = 25640309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5059 + ... + 8767.

It is an arithmetic number, because the mean of its divisors is an integer number (3324160).

Almost surely, 2^25640317 is an apocalyptic number.

It is an amenable number.

25640317 is a deficient number, since it is larger than the sum of its proper divisors (952963).

25640317 is a wasteful number, since it uses less digits than its factorization.

25640317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 25640317 is about 5063.6268622401. The cubic root of 25640317 is about 294.8771565518.

Adding to 25640317 its reverse (71304652), we get a palindrome (96944969).

The spelling of 25640317 in words is "twenty-five million, six hundred forty thousand, three hundred seventeen".