78281279999 has 16 divisors (see below), whose sum is σ = 89628057792. Its totient is φ = 67813794048.

The previous prime is 78281279987. The next prime is 78281280019. The reversal of 78281279999 is 99997218287.

It is not a de Polignac number, because 78281279999 - 2¹² = 78281275903 is a prime.

It is a super-2 number, since 2×78281279999² (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 (78281279939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2454062 + ... + 2485755.

It is an arithmetic number, because the mean of its divisors is an integer number (5601753612).

Almost surely, 2^78281279999 is an apocalyptic number.

78281279999 is a deficient number, since it is larger than the sum of its proper divisors (11346777793).

78281279999 is a wasteful number, since it uses less digits than its factorization.

78281279999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4939906.

The product of its digits is 82301184, while the sum is 71.

The spelling of 78281279999 in words is "seventy-eight billion, two hundred eighty-one million, two hundred seventy-nine thousand, nine hundred ninety-nine".