25979780 has 12 divisors (see below), whose sum is σ = 54557580. Its totient is φ = 10391904.

The previous prime is 25979771. The next prime is 25979813. The reversal of 25979780 is 8797952.

It can be written as a sum of positive squares in 2 ways, for example, as 13645636 + 12334144 = 3694^2 + 3512^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649475 + ... + 649514.

It is an arithmetic number, because the mean of its divisors is an integer number (4546465).

Almost surely, 2^25979780 is an apocalyptic number.

25979780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25979780 is an abundant number, since it is smaller than the sum of its proper divisors (28577800).

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

25979780 is a wasteful number, since it uses less digits than its factorization.

25979780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298998 (or 1298996 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 25979780 is about 5097.0363938273. The cubic root of 25979780 is about 296.1727899105.

The spelling of 25979780 in words is "twenty-five million, nine hundred seventy-nine thousand, seven hundred eighty".