78281726667 has 16 divisors (see below), whose sum is σ = 110521055520. Its totient is φ = 49115423232.

The previous prime is 78281726651. The next prime is 78281726729. The reversal of 78281726667 is 76662718287.

It is a happy number.

It is not a de Polignac number, because 78281726667 - 2⁴ = 78281726651 is a prime.

It is a super-2 number, since 2×78281726667² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78281726667.

It is not an unprimeable number, because it can be changed into a prime (78281726267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1765809 + ... + 1809597.

It is an arithmetic number, because the mean of its divisors is an integer number (6907565970).

Almost surely, 2^78281726667 is an apocalyptic number.

78281726667 is a deficient number, since it is larger than the sum of its proper divisors (32239328853).

78281726667 is a wasteful number, since it uses less digits than its factorization.

78281726667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78862.

The product of its digits is 18966528, while the sum is 60.

The spelling of 78281726667 in words is "seventy-eight billion, two hundred eighty-one million, seven hundred twenty-six thousand, six hundred sixty-seven".