78027191808 has 160 divisors (see below), whose sum is σ = 213274778112. Its totient is φ = 25336012800.

The previous prime is 78027191789. The next prime is 78027191819. The reversal of 78027191808 is 80819172087.

It is a super-2 number, since 2×78027191808² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28465318 + ... + 28468058.

Almost surely, 2^78027191808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78027191808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106637389056).

78027191808 is an abundant number, since it is smaller than the sum of its proper divisors (135247586304).

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

78027191808 is a wasteful number, since it uses less digits than its factorization.

78027191808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236 (or 3220 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 78027191808 in words is "seventy-eight billion, twenty-seven million, one hundred ninety-one thousand, eight hundred eight".