78781221120 has 144 divisors (see below), whose sum is σ = 287551555200. Its totient is φ = 18007130112.

The previous prime is 78781221119. The next prime is 78781221131. The reversal of 78781221120 is 2112218787.

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, 1438545 + ... + 1492304.

It is an arithmetic number, because the mean of its divisors is an integer number (1996885800).

Almost surely, 2^78781221120 is an apocalyptic number.

78781221120 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78781221120 is an abundant number, since it is smaller than the sum of its proper divisors (208770334080).

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

78781221120 is a wasteful number, since it uses less digits than its factorization.

78781221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930880 (or 2930866 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 39.

The spelling of 78781221120 in words is "seventy-eight billion, seven hundred eighty-one million, two hundred twenty-one thousand, one hundred twenty".