25664616 has 24 divisors (see below), whose sum is σ = 69508530. Its totient is φ = 8554848.

The previous prime is 25664599. The next prime is 25664629. The reversal of 25664616 is 61646652.

It is a happy number.

25664616 is a `hidden beast` number, since 2 + 5 + 6 + 646 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25462116 + 202500 = 5046^2 + 450^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178155 + ... + 178298.

Almost surely, 2^25664616 is an apocalyptic number.

It is an amenable number.

25664616 is an abundant number, since it is smaller than the sum of its proper divisors (43843914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25664616 is a wasteful number, since it uses less digits than its factorization.

25664616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356465 (or 356458 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 25664616 is about 5066.0256612062. The cubic root of 25664616 is about 294.9702775762.

The spelling of 25664616 in words is "twenty-five million, six hundred sixty-four thousand, six hundred sixteen".