78281071218 has 192 divisors, whose sum is σ = 205887830400. Its totient is φ = 22253652288.

The previous prime is 78281071217. The next prime is 78281071223. The reversal of 78281071218 is 81217018287.

It is a happy number.

It is a super-2 number, since 2×78281071218² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78281071217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 48651198 + ... + 48652806.

It is an arithmetic number, because the mean of its divisors is an integer number (1072332450).

Almost surely, 2^78281071218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78281071218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102943915200).

78281071218 is an abundant number, since it is smaller than the sum of its proper divisors (127606759182).

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

78281071218 is a wasteful number, since it uses less digits than its factorization.

78281071218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873 (or 1848 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 45.

The spelling of 78281071218 in words is "seventy-eight billion, two hundred eighty-one million, seventy-one thousand, two hundred eighteen".