78927789312 has 720 divisors, whose sum is σ = 263263537152. Its totient is φ = 23410114560.

The previous prime is 78927789307. The next prime is 78927789313. The reversal of 78927789312 is 21398772987.

It is a super-2 number, since 2×78927789312² (a number of 23 digits) contains 22 as substring.

Its product of digits (21337344) is a multiple of the sum of its prime factors (256).

It is a self number, because there is not a number n which added to its sum of digits gives 78927789312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78927789313) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 621478593 + ... + 621478719.

Almost surely, 2^78927789312 is an apocalyptic number.

78927789312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78927789312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131631768576).

78927789312 is an abundant number, since it is smaller than the sum of its proper divisors (184335747840).

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

78927789312 is a wasteful number, since it uses less digits than its factorization.

78927789312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 233 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 78927789312 in words is "seventy-eight billion, nine hundred twenty-seven million, seven hundred eighty-nine thousand, three hundred twelve".