25640297 has 8 divisors (see below), whose sum is σ = 26728896. Its totient is φ = 24572592.

The previous prime is 25640281. The next prime is 25640299. The reversal of 25640297 is 79204652.

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 25640297 - 2⁴ = 25640281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640299) 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, 2693 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (3341112).

Almost surely, 2^25640297 is an apocalyptic number.

It is an amenable number.

25640297 is a deficient number, since it is larger than the sum of its proper divisors (1088599).

25640297 is a wasteful number, since it uses less digits than its factorization.

25640297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10447.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 25640297 is about 5063.6248873707. The cubic root of 25640297 is about 294.8770798816.

The spelling of 25640297 in words is "twenty-five million, six hundred forty thousand, two hundred ninety-seven".