78427686493 has 8 divisors (see below), whose sum is σ = 84598376408. Its totient is φ = 72276681024.

The previous prime is 78427686473. The next prime is 78427686497. The reversal of 78427686493 is 39468672487.

It can be written as a sum of positive squares in 4 ways, for example, as 15505977529 + 62921708964 = 124523^2 + 250842^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78427686493 - 2²⁹ = 77890815581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427686497) 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 7 ways as a sum of consecutive naturals, for example, 4912830 + ... + 4928767.

It is an arithmetic number, because the mean of its divisors is an integer number (10574797051).

Almost surely, 2^78427686493 is an apocalyptic number.

It is an amenable number.

78427686493 is a deficient number, since it is larger than the sum of its proper divisors (6170689915).

78427686493 is a wasteful number, since it uses less digits than its factorization.

78427686493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9842223.

The product of its digits is 97542144, while the sum is 64.

The spelling of 78427686493 in words is "seventy-eight billion, four hundred twenty-seven million, six hundred eighty-six thousand, four hundred ninety-three".