78634443687 has 16 divisors (see below), whose sum is σ = 111154447872. Its totient is φ = 49276540800.

The previous prime is 78634443683. The next prime is 78634443691.

78634443687 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (78634443683) and next prime (78634443691).

It is not a de Polignac number, because 78634443687 - 2² = 78634443683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78634443687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78634443683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939439 + ... + 1019712.

It is an arithmetic number, because the mean of its divisors is an integer number (6947152992).

Almost surely, 2^78634443687 is an apocalyptic number.

78634443687 is a deficient number, since it is larger than the sum of its proper divisors (32520004185).

78634443687 is a wasteful number, since it uses less digits than its factorization.

78634443687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959958.

The product of its digits is 65028096, while the sum is 60.

The spelling of 78634443687 in words is "seventy-eight billion, six hundred thirty-four million, four hundred forty-three thousand, six hundred eighty-seven".