25297664 has 72 divisors (see below), whose sum is σ = 60829440. Its totient is φ = 10257408.

The previous prime is 25297633. The next prime is 25297669. The reversal of 25297664 is 46679252.

It is not an unprimeable number, because it can be changed into a prime (25297669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33677 + ... + 34419.

Almost surely, 2^25297664 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 25297664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30414720).

25297664 is an abundant number, since it is smaller than the sum of its proper divisors (35531776).

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

25297664 is an equidigital number, since it uses as much as digits as its factorization.

25297664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785 (or 771 counting only the distinct ones).

The product of its digits is 181440, while the sum is 41.

The square root of 25297664 is about 5029.6783197338. The cubic root of 25297664 is about 293.5576979495.

The spelling of 25297664 in words is "twenty-five million, two hundred ninety-seven thousand, six hundred sixty-four".