78819891827 has 8 divisors (see below), whose sum is σ = 79038228816. Its totient is φ = 78601756032.

The previous prime is 78819891797. The next prime is 78819891841. The reversal of 78819891827 is 72819891887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78819891827 - 2²⁶ = 78752782963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78819891847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751928 + ... + 850314.

It is an arithmetic number, because the mean of its divisors is an integer number (9879778602).

Almost surely, 2^78819891827 is an apocalyptic number.

78819891827 is a deficient number, since it is larger than the sum of its proper divisors (218336989).

78819891827 is a wasteful number, since it uses less digits than its factorization.

78819891827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100597.

The product of its digits is 32514048, while the sum is 68.

The spelling of 78819891827 in words is "seventy-eight billion, eight hundred nineteen million, eight hundred ninety-one thousand, eight hundred twenty-seven".