78642857216 has 72 divisors (see below), whose sum is σ = 195713523264. Its totient is φ = 30640066560.

The previous prime is 78642857213. The next prime is 78642857261. The reversal of 78642857216 is 61275824687.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78642857213) 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, 1975085 + ... + 2014508.

Almost surely, 2^78642857216 is an apocalyptic number.

It is an amenable number.

78642857216 is an abundant number, since it is smaller than the sum of its proper divisors (117070666048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78642857216 is a wasteful number, since it uses less digits than its factorization.

78642857216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989627 (or 3989613 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 56.

The spelling of 78642857216 in words is "seventy-eight billion, six hundred forty-two million, eight hundred fifty-seven thousand, two hundred sixteen".