78891478956 has 84 divisors (see below), whose sum is σ = 207222621984. Its totient is φ = 26268300000.

The previous prime is 78891478873. The next prime is 78891478973. The reversal of 78891478956 is 65987419887.

78891478956 is a `hidden beast` number, since 78 + 89 + 1 + 478 + 9 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2729581 + ... + 2758331.

It is an arithmetic number, because the mean of its divisors is an integer number (2466935976).

Almost surely, 2^78891478956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78891478956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103611310992).

78891478956 is an abundant number, since it is smaller than the sum of its proper divisors (128331143028).

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

78891478956 is a wasteful number, since it uses less digits than its factorization.

78891478956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29714 (or 29697 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 72.

The spelling of 78891478956 in words is "seventy-eight billion, eight hundred ninety-one million, four hundred seventy-eight thousand, nine hundred fifty-six".