26986679780 has 24 divisors (see below), whose sum is σ = 56915264952. Its totient is φ = 10748340992.

The previous prime is 26986679771. The next prime is 26986679803. The reversal of 26986679780 is 8797668962.

It can be written as a sum of positive squares in 4 ways, for example, as 490002496 + 26496677284 = 22136^2 + 162778^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 26986679780.

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 7 ways as a sum of consecutive naturals, for example, 2890907 + ... + 2900226.

It is an arithmetic number, because the mean of its divisors is an integer number (2371469373).

Almost surely, 2^26986679780 is an apocalyptic number.

26986679780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26986679780 is an abundant number, since it is smaller than the sum of its proper divisors (29928585172).

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

26986679780 is a wasteful number, since it uses less digits than its factorization.

26986679780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791375 (or 5791373 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 68.

The spelling of 26986679780 in words is "twenty-six billion, nine hundred eighty-six million, six hundred seventy-nine thousand, seven hundred eighty".