25798720 has 28 divisors (see below), whose sum is σ = 61433964. Its totient is φ = 10319360.

The previous prime is 25798693. The next prime is 25798739. The reversal of 25798720 is 2789752.

It can be written as a sum of positive squares in 2 ways, for example, as 3444736 + 22353984 = 1856^2 + 4728^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39991 + ... + 40630.

Almost surely, 2^25798720 is an apocalyptic number.

25798720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25798720 is an abundant number, since it is smaller than the sum of its proper divisors (35635244).

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

25798720 is an equidigital number, since it uses as much as digits as its factorization.

25798720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80638 (or 80628 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 25798720 is about 5079.2440382403. The cubic root of 25798720 is about 295.4831496638.

The spelling of 25798720 in words is "twenty-five million, seven hundred ninety-eight thousand, seven hundred twenty".