78678968394 has 64 divisors (see below), whose sum is σ = 173261410560. Its totient is φ = 23811802560.

The previous prime is 78678968371. The next prime is 78678968419. The reversal of 78678968394 is 49386987687.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 755179 + ... + 853025.

It is an arithmetic number, because the mean of its divisors is an integer number (2707209540).

Almost surely, 2^78678968394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78678968394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86630705280).

78678968394 is an abundant number, since it is smaller than the sum of its proper divisors (94582442166).

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

78678968394 is a wasteful number, since it uses less digits than its factorization.

78678968394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97952 (or 97926 counting only the distinct ones).

The product of its digits is 877879296, while the sum is 75.

The spelling of 78678968394 in words is "seventy-eight billion, six hundred seventy-eight million, nine hundred sixty-eight thousand, three hundred ninety-four".