27878816368 has 20 divisors (see below), whose sum is σ = 58170223048. Its totient is φ = 12867145920.

The previous prime is 27878816323. The next prime is 27878816369. The reversal of 27878816368 is 86361887872.

It is a happy number.

It is a super-2 number, since 2×27878816368² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27878816369) 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, 67016178 + ... + 67016593.

Almost surely, 2^27878816368 is an apocalyptic number.

It is an amenable number.

27878816368 is an abundant number, since it is smaller than the sum of its proper divisors (30291406680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27878816368 is a wasteful number, since it uses less digits than its factorization.

27878816368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134032792 (or 134032786 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 64.

The spelling of 27878816368 in words is "twenty-seven billion, eight hundred seventy-eight million, eight hundred sixteen thousand, three hundred sixty-eight".