78967778988 has 96 divisors (see below), whose sum is σ = 215516044800. Its totient is φ = 22038322176.

The previous prime is 78967778987. The next prime is 78967778999. The reversal of 78967778988 is 88987776987.

It is a super-2 number, since 2×78967778988² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (84).

It is a self number, because there is not a number n which added to its sum of digits gives 78967778988.

It is not an unprimeable number, because it can be changed into a prime (78967778987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 727348 + ... + 828836.

It is an arithmetic number, because the mean of its divisors is an integer number (2244958800).

Almost surely, 2^78967778988 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 78967778988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107758022400).

78967778988 is an abundant number, since it is smaller than the sum of its proper divisors (136548265812).

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

78967778988 is a wasteful number, since it uses less digits than its factorization.

78967778988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101719 (or 101717 counting only the distinct ones).

The product of its digits is 4779565056, while the sum is 84.

The spelling of 78967778988 in words is "seventy-eight billion, nine hundred sixty-seven million, seven hundred seventy-eight thousand, nine hundred eighty-eight".