25666240 has 28 divisors (see below), whose sum is σ = 61118496. Its totient is φ = 10266368.

The previous prime is 25666237. The next prime is 25666241. The reversal of 25666240 is 4266652.

It is not an unprimeable number, because it can be changed into a prime (25666241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39784 + ... + 40423.

Almost surely, 2^25666240 is an apocalyptic number.

25666240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25666240 is an abundant number, since it is smaller than the sum of its proper divisors (35452256).

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

25666240 is an equidigital number, since it uses as much as digits as its factorization.

25666240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80224 (or 80214 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 25666240 is about 5066.1859421067. The cubic root of 25666240 is about 294.9764991333.

The spelling of 25666240 in words is "twenty-five million, six hundred sixty-six thousand, two hundred forty".