25605605 has 8 divisors (see below), whose sum is σ = 30781464. Its totient is φ = 20448000.

The previous prime is 25605589. The next prime is 25605649. The reversal of 25605605 is 50650652.

It can be written as a sum of positive squares in 4 ways, for example, as 5909761 + 19695844 = 2431^2 + 4438^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25605605 - 2⁴ = 25605589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1256 + ... + 7265.

It is an arithmetic number, because the mean of its divisors is an integer number (3847683).

Almost surely, 2^25605605 is an apocalyptic number.

It is an amenable number.

25605605 is a deficient number, since it is larger than the sum of its proper divisors (5175859).

25605605 is an equidigital number, since it uses as much as digits as its factorization.

25605605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 25605605 is about 5060.1981186511. The cubic root of 25605605 is about 294.7440276930.

The spelling of 25605605 in words is "twenty-five million, six hundred five thousand, six hundred five".