25979820 has 48 divisors (see below), whose sum is σ = 73156608. Its totient is φ = 6888640.

The previous prime is 25979813. The next prime is 25979827. The reversal of 25979820 is 2897952.

It is an interprime number because it is at equal distance from previous prime (25979813) and next prime (25979827).

It is not an unprimeable number, because it can be changed into a prime (25979827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10327 + ... + 12593.

It is an arithmetic number, because the mean of its divisors is an integer number (1524096).

Almost surely, 2^25979820 is an apocalyptic number.

25979820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25979820 is an abundant number, since it is smaller than the sum of its proper divisors (47176788).

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

25979820 is a wasteful number, since it uses less digits than its factorization.

25979820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470 (or 2468 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 25979820 is about 5097.0403176746. The cubic root of 25979820 is about 296.1729419121.

The spelling of 25979820 in words is "twenty-five million, nine hundred seventy-nine thousand, eight hundred twenty".