78927789311 has 4 divisors (see below), whose sum is σ = 90203187792. Its totient is φ = 67652390832.

The previous prime is 78927789307. The next prime is 78927789313. The reversal of 78927789311 is 11398772987.

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 78927789311 - 2² = 78927789307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78927789313) 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, 5637699230 + ... + 5637699243.

It is an arithmetic number, because the mean of its divisors is an integer number (22550796948).

Almost surely, 2^78927789311 is an apocalyptic number.

78927789311 is a deficient number, since it is larger than the sum of its proper divisors (11275398481).

78927789311 is a wasteful number, since it uses less digits than its factorization.

78927789311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11275398480.

The product of its digits is 10668672, while the sum is 62.

The spelling of 78927789311 in words is "seventy-eight billion, nine hundred twenty-seven million, seven hundred eighty-nine thousand, three hundred eleven".