25640337 has 4 divisors (see below), whose sum is σ = 34187120. Its totient is φ = 17093556.

The previous prime is 25640311. The next prime is 25640339. The reversal of 25640337 is 73304652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25640337 - 2⁸ = 25640081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640339) 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 3 ways as a sum of consecutive naturals, for example, 4273387 + ... + 4273392.

It is an arithmetic number, because the mean of its divisors is an integer number (8546780).

Almost surely, 2^25640337 is an apocalyptic number.

It is an amenable number.

25640337 is a deficient number, since it is larger than the sum of its proper divisors (8546783).

25640337 is an equidigital number, since it uses as much as digits as its factorization.

25640337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8546782.

The product of its (nonzero) digits is 15120, while the sum is 30.

The square root of 25640337 is about 5063.6288371088. The cubic root of 25640337 is about 294.8772332219.

Adding to 25640337 its reverse (73304652), we get a palindrome (98944989).

The spelling of 25640337 in words is "twenty-five million, six hundred forty thousand, three hundred thirty-seven".