78847974287 has 4 divisors (see below), whose sum is σ = 78848594760. Its totient is φ = 78847353816.

The previous prime is 78847974263. The next prime is 78847974341. The reversal of 78847974287 is 78247974887.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 78847974287 - 2¹⁸ = 78847712143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78847974287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78847974187) 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, 42737 + ... + 399402.

It is an arithmetic number, because the mean of its divisors is an integer number (19712148690).

Almost surely, 2^78847974287 is an apocalyptic number.

78847974287 is a deficient number, since it is larger than the sum of its proper divisors (620473).

78847974287 is a wasteful number, since it uses less digits than its factorization.

78847974287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620472.

The product of its digits is 354041856, while the sum is 71.

The spelling of 78847974287 in words is "seventy-eight billion, eight hundred forty-seven million, nine hundred seventy-four thousand, two hundred eighty-seven".