25666720 has 48 divisors (see below), whose sum is σ = 63836640. Its totient is φ = 9725184.

The previous prime is 25666717. The next prime is 25666723. The reversal of 25666720 is 2766652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25666717) and next prime (25666723).

It is not an unprimeable number, because it can be changed into a prime (25666723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1182 + ... + 7261.

It is an arithmetic number, because the mean of its divisors is an integer number (1329930).

Almost surely, 2^25666720 is an apocalyptic number.

25666720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25666720 is an abundant number, since it is smaller than the sum of its proper divisors (38169920).

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

25666720 is a wasteful number, since it uses less digits than its factorization.

25666720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8477 (or 8469 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 25666720 is about 5066.2333148010. The cubic root of 25666720 is about 294.9783379670.

The spelling of 25666720 in words is "twenty-five million, six hundred sixty-six thousand, seven hundred twenty".