78339688824 has 64 divisors (see below), whose sum is σ = 199743926400. Its totient is φ = 25596493184.

The previous prime is 78339688799. The next prime is 78339688831. The reversal of 78339688824 is 42888693387.

It is a super-2 number, since 2×78339688824² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411634 + ... + 571070.

It is an arithmetic number, because the mean of its divisors is an integer number (3120998850).

Almost surely, 2^78339688824 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 78339688824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99871963200).

78339688824 is an abundant number, since it is smaller than the sum of its proper divisors (121404237576).

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

78339688824 is a wasteful number, since it uses less digits than its factorization.

78339688824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159852 (or 159848 counting only the distinct ones).

The product of its digits is 111476736, while the sum is 66.

The spelling of 78339688824 in words is "seventy-eight billion, three hundred thirty-nine million, six hundred eighty-eight thousand, eight hundred twenty-four".