78921934848 has 192 divisors, whose sum is σ = 234482976000. Its totient is φ = 26228883456.

The previous prime is 78921934811. The next prime is 78921934849. The reversal of 78921934848 is 84843912987.

78921934848 is a `hidden beast` number, since 78 + 9 + 219 + 348 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (78921934849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20291688 + ... + 20295576.

It is an arithmetic number, because the mean of its divisors is an integer number (1221265500).

Almost surely, 2^78921934848 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 78921934848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117241488000).

78921934848 is an abundant number, since it is smaller than the sum of its proper divisors (155561041152).

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

78921934848 is a wasteful number, since it uses less digits than its factorization.

78921934848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287 (or 4261 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 78921934848 in words is "seventy-eight billion, nine hundred twenty-one million, nine hundred thirty-four thousand, eight hundred forty-eight".