78259887279 has 12 divisors (see below), whose sum is σ = 129190925136. Its totient is φ = 44719935552.

The previous prime is 78259887197. The next prime is 78259887301. The reversal of 78259887279 is 97278895287.

78259887279 is a `hidden beast` number, since 7 + 8 + 2 + 598 + 8 + 7 + 27 + 9 = 666.

It is not a de Polignac number, because 78259887279 - 2²⁷ = 78125669551 is a prime.

It is a super-2 number, since 2×78259887279² (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 (78259897279) 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 11 ways as a sum of consecutive naturals, for example, 621110154 + ... + 621110279.

It is an arithmetic number, because the mean of its divisors is an integer number (10765910428).

Almost surely, 2^78259887279 is an apocalyptic number.

78259887279 is a deficient number, since it is larger than the sum of its proper divisors (50931037857).

78259887279 is a wasteful number, since it uses less digits than its factorization.

78259887279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242220446 (or 1242220443 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 72.

The spelling of 78259887279 in words is "seventy-eight billion, two hundred fifty-nine million, eight hundred eighty-seven thousand, two hundred seventy-nine".