25605679 has 4 divisors (see below), whose sum is σ = 27933480. Its totient is φ = 23277880.

The previous prime is 25605677. The next prime is 25605691. The reversal of 25605679 is 97650652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25605679 - 2¹ = 25605677 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25605677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163884 + ... + 1163905.

It is an arithmetic number, because the mean of its divisors is an integer number (6983370).

Almost surely, 2^25605679 is an apocalyptic number.

25605679 is a deficient number, since it is larger than the sum of its proper divisors (2327801).

25605679 is a wasteful number, since it uses less digits than its factorization.

25605679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327800.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 25605679 is about 5060.2054306125. The cubic root of 25605679 is about 294.7443116287.

The spelling of 25605679 in words is "twenty-five million, six hundred five thousand, six hundred seventy-nine".