25720617 has 24 divisors (see below), whose sum is σ = 37589664. Its totient is φ = 15634944.

The previous prime is 25720613. The next prime is 25720619. The reversal of 25720617 is 71602752.

It is not a de Polignac number, because 25720617 - 2² = 25720613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25720613) 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, 48918 + ... + 49440.

It is an arithmetic number, because the mean of its divisors is an integer number (1566236).

Almost surely, 2^25720617 is an apocalyptic number.

It is an amenable number.

25720617 is a deficient number, since it is larger than the sum of its proper divisors (11869047).

25720617 is a wasteful number, since it uses less digits than its factorization.

25720617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 25720617 is about 5071.5497631395. The cubic root of 25720617 is about 295.1846665275.

The spelling of 25720617 in words is "twenty-five million, seven hundred twenty thousand, six hundred seventeen".