25605081 has 24 divisors (see below), whose sum is σ = 38255360. Its totient is φ = 16492896.

The previous prime is 25605071. The next prime is 25605089. The reversal of 25605081 is 18050652.

It is not a de Polignac number, because 25605081 - 2⁶ = 25605017 is a prime.

It is a super-2 number, since 2×25605081² = 1311240346033122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25605089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41880 + ... + 42486.

Almost surely, 2^25605081 is an apocalyptic number.

It is an amenable number.

25605081 is a deficient number, since it is larger than the sum of its proper divisors (12650279).

25605081 is a wasteful number, since it uses less digits than its factorization.

25605081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 25605081 is about 5060.1463417573. The cubic root of 25605081 is about 294.7420171056.

The spelling of 25605081 in words is "twenty-five million, six hundred five thousand, eighty-one".