25608009 has 16 divisors (see below), whose sum is σ = 39105920. Its totient is φ = 14601600.

The previous prime is 25607999. The next prime is 25608031. The reversal of 25608009 is 90080652.

It is not a de Polignac number, because 25608009 - 2⁵ = 25607977 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (25608049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11607 + ... + 13635.

It is an arithmetic number, because the mean of its divisors is an integer number (2444120).

Almost surely, 2^25608009 is an apocalyptic number.

It is an amenable number.

25608009 is a deficient number, since it is larger than the sum of its proper divisors (13497911).

25608009 is a wasteful number, since it uses less digits than its factorization.

25608009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 25608009 is about 5060.4356531824. The cubic root of 25608009 is about 294.7532514869.

The spelling of 25608009 in words is "twenty-five million, six hundred eight thousand, nine".