25664652 has 144 divisors (see below), whose sum is σ = 75828480. Its totient is φ = 7257600.

The previous prime is 25664629. The next prime is 25664657. The reversal of 25664652 is 25646652.

25664652 is a `hidden beast` number, since 2 + 5 + 6 + 646 + 5 + 2 = 666.

It is a super-2 number, since 2×25664652² = 1317348724562208, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

Its product of digits (86400) is a multiple of the sum of its prime factors (144).

It is not an unprimeable number, because it can be changed into a prime (25664657) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 420702 + ... + 420762.

Almost surely, 2^25664652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25664652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37914240).

25664652 is an abundant number, since it is smaller than the sum of its proper divisors (50163828).

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

25664652 is a wasteful number, since it uses less digits than its factorization.

25664652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 139 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 25664652 is about 5066.0292142861. The cubic root of 25664652 is about 294.9704154953.

The spelling of 25664652 in words is "twenty-five million, six hundred sixty-four thousand, six hundred fifty-two".