78340727858 has 8 divisors (see below), whose sum is σ = 117636506652. Its totient is φ = 39128558976.

The previous prime is 78340727827. The next prime is 78340727891. The reversal of 78340727858 is 85872704387.

It can be written as a sum of positive squares in 2 ways, for example, as 58412605969 + 19928121889 = 241687^2 + 141167^2 .

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

It is a super-2 number, since 2×78340727858² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78340727797 and 78340727806.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20900135 + ... + 20903882.

Almost surely, 2^78340727858 is an apocalyptic number.

78340727858 is a deficient number, since it is larger than the sum of its proper divisors (39295778794).

78340727858 is a wasteful number, since it uses less digits than its factorization.

78340727858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41804956.

The product of its (nonzero) digits is 21073920, while the sum is 59.

The spelling of 78340727858 in words is "seventy-eight billion, three hundred forty million, seven hundred twenty-seven thousand, eight hundred fifty-eight".