25999980 has 48 divisors (see below), whose sum is σ = 76634880. Its totient is φ = 6568128.

The previous prime is 25999949. The next prime is 26000003. The reversal of 25999980 is 8999952.

It is an unprimeable number.

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, 10264 + ... + 12543.

It is an arithmetic number, because the mean of its divisors is an integer number (1596560).

Almost surely, 2^25999980 is an apocalyptic number.

25999980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25999980 is an abundant number, since it is smaller than the sum of its proper divisors (50634900).

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

25999980 is a wasteful number, since it uses less digits than its factorization.

25999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22838 (or 22836 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 51.

The square root of 25999980 is about 5099.0175524311. The cubic root of 25999980 is about 296.2495308793.

The spelling of 25999980 in words is "twenty-five million, nine hundred ninety-nine thousand, nine hundred eighty".