26978987363538 has 16 divisors (see below), whose sum is σ = 61666256831040. Its totient is φ = 7708282103856.

The previous prime is 26978987363507. The next prime is 26978987363563. The reversal of 26978987363538 is 83536378987962.

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, 321178420953 + ... + 321178421036.

It is an arithmetic number, because the mean of its divisors is an integer number (3854141051940).

Almost surely, 2^{26978987363538} is an apocalyptic number.

26978987363538 is an abundant number, since it is smaller than the sum of its proper divisors (34687269467502).

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

26978987363538 is a wasteful number, since it uses less digits than its factorization.

26978987363538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642356842001.

The product of its digits is 19752284160, while the sum is 84.

The spelling of 26978987363538 in words is "twenty-six trillion, nine hundred seventy-eight billion, nine hundred eighty-seven million, three hundred sixty-three thousand, five hundred thirty-eight".