78308078639 has 16 divisors (see below), whose sum is σ = 94873780800. Its totient is φ = 63096620544.

The previous prime is 78308078623. The next prime is 78308078663. The reversal of 78308078639 is 93687080387.

It is a cyclic number.

It is not a de Polignac number, because 78308078639 - 2⁴ = 78308078623 is a prime.

It is a super-2 number, since 2×78308078639² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78308078669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298244 + ... + 495545.

It is an arithmetic number, because the mean of its divisors is an integer number (5929611300).

Almost surely, 2^78308078639 is an apocalyptic number.

78308078639 is a deficient number, since it is larger than the sum of its proper divisors (16565702161).

78308078639 is a wasteful number, since it uses less digits than its factorization.

78308078639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794642.

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 78308078639 in words is "seventy-eight billion, three hundred eight million, seventy-eight thousand, six hundred thirty-nine".