25566720 has 80 divisors (see below), whose sum is σ = 81758160. Its totient is φ = 6815744.

The previous prime is 25566707. The next prime is 25566733. The reversal of 25566720 is 2766552.

It is an interprime number because it is at equal distance from previous prime (25566707) and next prime (25566733).

It is a tau number, because it is divible by the number of its divisors (80).

It is a zygodrome in base 2.

It is a congruent number.

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, 6016 + ... + 9344.

It is an arithmetic number, because the mean of its divisors is an integer number (1021977).

Almost surely, 2^25566720 is an apocalyptic number.

25566720 is a gapful number since it is divisible by the number (20) 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 25566720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40879080).

25566720 is an abundant number, since it is smaller than the sum of its proper divisors (56191440).

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

25566720 is an equidigital number, since it uses as much as digits as its factorization.

25566720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355 (or 3339 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 25566720 is about 5056.3544179577. The cubic root of 25566720 is about 294.5947514169.

The spelling of 25566720 in words is "twenty-five million, five hundred sixty-six thousand, seven hundred twenty".