26979881287 has 4 divisors (see below), whose sum is σ = 26980931656. Its totient is φ = 26978830920.

The previous prime is 26979881273. The next prime is 26979881303. The reversal of 26979881287 is 78218897962.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26979881287 - 2¹¹ = 26979879239 is a prime.

It is a super-2 number, since 2×26979881287² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26979881207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485664 + ... + 538357.

It is an arithmetic number, because the mean of its divisors is an integer number (6745232914).

Almost surely, 2^26979881287 is an apocalyptic number.

26979881287 is a deficient number, since it is larger than the sum of its proper divisors (1050369).

26979881287 is a wasteful number, since it uses less digits than its factorization.

26979881287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050368.

The product of its digits is 48771072, while the sum is 67.

The spelling of 26979881287 in words is "twenty-six billion, nine hundred seventy-nine million, eight hundred eighty-one thousand, two hundred eighty-seven".