78939730044 has 144 divisors (see below), whose sum is σ = 241576171200. Its totient is φ = 21217517568.

The previous prime is 78939730043. The next prime is 78939730069. The reversal of 78939730044 is 44003793987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78939730043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16143952 + ... + 16148840.

It is an arithmetic number, because the mean of its divisors is an integer number (1677612300).

Almost surely, 2^78939730044 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 78939730044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120788085600).

78939730044 is an abundant number, since it is smaller than the sum of its proper divisors (162636441156).

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

78939730044 is a wasteful number, since it uses less digits than its factorization.

78939730044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8692 (or 8687 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 78939730044 in words is "seventy-eight billion, nine hundred thirty-nine million, seven hundred thirty thousand, forty-four".