78726587658879 has 4 divisors (see below), whose sum is σ = 104968783545176. Its totient is φ = 52484391772584.

The previous prime is 78726587658871. The next prime is 78726587658883. The reversal of 78726587658879 is 97885678562787.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78726587658879 - 2³ = 78726587658871 is a prime.

It is a super-2 number, since 2×78726587658879² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78726587658792 and 78726587658801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78726587658871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13121097943144 + ... + 13121097943149.

It is an arithmetic number, because the mean of its divisors is an integer number (26242195886294).

Almost surely, 2^{78726587658879} is an apocalyptic number.

78726587658879 is a deficient number, since it is larger than the sum of its proper divisors (26242195886297).

78726587658879 is a wasteful number, since it uses less digits than its factorization.

78726587658879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26242195886296.

The product of its digits is 159318835200, while the sum is 93.

The spelling of 78726587658879 in words is "seventy-eight trillion, seven hundred twenty-six billion, five hundred eighty-seven million, six hundred fifty-eight thousand, eight hundred seventy-nine".