25688005 has 12 divisors (see below), whose sum is σ = 35858700. Its totient is φ = 17614464.

The previous prime is 25687993. The next prime is 25688009. The reversal of 25688005 is 50088652.

It can be written as a sum of positive squares in 2 ways, for example, as 5239521 + 20448484 = 2289^2 + 4522^2 .

It is not a de Polignac number, because 25688005 - 2⁵ = 25687973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25688009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52180 + ... + 52669.

It is an arithmetic number, because the mean of its divisors is an integer number (2988225).

Almost surely, 2^25688005 is an apocalyptic number.

It is an amenable number.

25688005 is a deficient number, since it is larger than the sum of its proper divisors (10170695).

25688005 is a wasteful number, since it uses less digits than its factorization.

25688005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104868 (or 104861 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 25688005 is about 5068.3335525595. Note that the first 3 decimals coincide. The cubic root of 25688005 is about 295.0598557085.

The spelling of 25688005 in words is "twenty-five million, six hundred eighty-eight thousand, five".