25664987 has 8 divisors (see below), whose sum is σ = 26882304. Its totient is φ = 24456168.

The previous prime is 25664983. The next prime is 25665041. The reversal of 25664987 is 78946652.

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

It is a cyclic number.

It is not a de Polignac number, because 25664987 - 2² = 25664983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25664983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4538 + ... + 8480.

It is an arithmetic number, because the mean of its divisors is an integer number (3360288).

Almost surely, 2^25664987 is an apocalyptic number.

25664987 is a deficient number, since it is larger than the sum of its proper divisors (1217317).

25664987 is a wasteful number, since it uses less digits than its factorization.

25664987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249.

The product of its digits is 725760, while the sum is 47.

The square root of 25664987 is about 5066.0622775485. The cubic root of 25664987 is about 294.9716989033.

The spelling of 25664987 in words is "twenty-five million, six hundred sixty-four thousand, nine hundred eighty-seven".