78347224639 has 6 divisors (see below), whose sum is σ = 78684976496. Its totient is φ = 78010916400.

The previous prime is 78347224601. The next prime is 78347224643. The reversal of 78347224639 is 93642274387.

It is not a de Polignac number, because 78347224639 - 2¹⁹ = 78346700351 is a prime.

It is a super-2 number, since 2×78347224639² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78347224639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78347224649) 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 5 ways as a sum of consecutive naturals, for example, 667287 + ... + 775864.

Almost surely, 2^78347224639 is an apocalyptic number.

78347224639 is a deficient number, since it is larger than the sum of its proper divisors (337751857).

78347224639 is an equidigital number, since it uses as much as digits as its factorization.

78347224639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443617 (or 1443384 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 55.

The spelling of 78347224639 in words is "seventy-eight billion, three hundred forty-seven million, two hundred twenty-four thousand, six hundred thirty-nine".