78281181231 has 48 divisors (see below), whose sum is σ = 115429104000. Its totient is φ = 47153444800.

The previous prime is 78281181217. The next prime is 78281181281. The reversal of 78281181231 is 13218118287.

It is a happy number.

It is not a de Polignac number, because 78281181231 - 2¹¹ = 78281179183 is a prime.

It is a super-2 number, since 2×78281181231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78281181281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52221520 + ... + 52223018.

It is an arithmetic number, because the mean of its divisors is an integer number (2404773000).

Almost surely, 2^78281181231 is an apocalyptic number.

78281181231 is a deficient number, since it is larger than the sum of its proper divisors (37147922769).

78281181231 is a wasteful number, since it uses less digits than its factorization.

78281181231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308 (or 2297 counting only the distinct ones).

The product of its digits is 43008, while the sum is 42.

The spelling of 78281181231 in words is "seventy-eight billion, two hundred eighty-one million, one hundred eighty-one thousand, two hundred thirty-one".