25745664 has 72 divisors (see below), whose sum is σ = 78326080. Its totient is φ = 7354368.

The previous prime is 25745641. The next prime is 25745689. The reversal of 25745664 is 46654752.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2982 + ... + 7770.

Almost surely, 2^25745664 is an apocalyptic number.

25745664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25745664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39163040).

25745664 is an abundant number, since it is smaller than the sum of its proper divisors (52580416).

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

25745664 is an equidigital number, since it uses as much as digits as its factorization.

25745664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815 (or 4801 counting only the distinct ones).

The product of its digits is 201600, while the sum is 39.

The square root of 25745664 is about 5074.0185257841. The cubic root of 25745664 is about 295.2804533910.

The spelling of 25745664 in words is "twenty-five million, seven hundred forty-five thousand, six hundred sixty-four".