78123923856 has 240 divisors, whose sum is σ = 246776205312. Its totient is φ = 22857465600.

The previous prime is 78123923821. The next prime is 78123923879. The reversal of 78123923856 is 65832932187.

It is a super-2 number, since 2×78123923856² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24697731 + ... + 24700893.

Almost surely, 2^78123923856 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 78123923856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123388102656).

78123923856 is an abundant number, since it is smaller than the sum of its proper divisors (168652281456).

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

78123923856 is a wasteful number, since it uses less digits than its factorization.

78123923856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722 (or 3713 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 78123923856 in words is "seventy-eight billion, one hundred twenty-three million, nine hundred twenty-three thousand, eight hundred fifty-six".