78139780992 has 432 divisors, whose sum is σ = 283269242880. Its totient is φ = 20605777920.

The previous prime is 78139780967. The next prime is 78139780993. The reversal of 78139780992 is 29908793187.

78139780992 is a `hidden beast` number, since 7 + 81 + 397 + 80 + 9 + 92 = 666.

It is a super-2 number, since 2×78139780992² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78139780993) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 9535617 + ... + 9543807.

It is an arithmetic number, because the mean of its divisors is an integer number (655715840).

Almost surely, 2^78139780992 is an apocalyptic number.

78139780992 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 78139780992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141634621440).

78139780992 is an abundant number, since it is smaller than the sum of its proper divisors (205129461888).

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

78139780992 is a wasteful number, since it uses less digits than its factorization.

78139780992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8251 (or 8216 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 63.

The spelling of 78139780992 in words is "seventy-eight billion, one hundred thirty-nine million, seven hundred eighty thousand, nine hundred ninety-two".