78630873791 has 4 divisors (see below), whose sum is σ = 78632295672. Its totient is φ = 78629451912.

The previous prime is 78630873773. The next prime is 78630873793. The reversal of 78630873791 is 19737803687.

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 78630873791 - 2²⁶ = 78563764927 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 78630873791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78630873793) 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, 624485 + ... + 739758.

It is an arithmetic number, because the mean of its divisors is an integer number (19658073918).

Almost surely, 2^78630873791 is an apocalyptic number.

78630873791 is a deficient number, since it is larger than the sum of its proper divisors (1421881).

78630873791 is a wasteful number, since it uses less digits than its factorization.

78630873791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421880.

The product of its (nonzero) digits is 10668672, while the sum is 59.

The spelling of 78630873791 in words is "seventy-eight billion, six hundred thirty million, eight hundred seventy-three thousand, seven hundred ninety-one".