25320840 has 32 divisors (see below), whose sum is σ = 75962880. Its totient is φ = 6752192.

The previous prime is 25320829. The next prime is 25320877. The reversal of 25320840 is 4802352.

It is a super-2 number, since 2×25320840² = 1282289876611200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25320840.

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, 105384 + ... + 105623.

It is an arithmetic number, because the mean of its divisors is an integer number (2373840).

Almost surely, 2^25320840 is an apocalyptic number.

25320840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25320840 is an abundant number, since it is smaller than the sum of its proper divisors (50642040).

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

25320840 is a wasteful number, since it uses less digits than its factorization.

25320840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211021 (or 211017 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 25320840 is about 5031.9817169779. The cubic root of 25320840 is about 293.6473164565.

The spelling of 25320840 in words is "twenty-five million, three hundred twenty thousand, eight hundred forty".