27778055556 has 96 divisors (see below), whose sum is σ = 73920591360. Its totient is φ = 8063967744.

The previous prime is 27778055531. The next prime is 27778055561. The reversal of 27778055556 is 65555087772.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 27778055496 and 27778055505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83335 + ... + 250001.

It is an arithmetic number, because the mean of its divisors is an integer number (770006160).

Almost surely, 2^27778055556 is an apocalyptic number.

It is a pronic number, being equal to 166667×166668.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27778055556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36960295680).

27778055556 is an abundant number, since it is smaller than the sum of its proper divisors (46142535804).

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

27778055556 is a wasteful number, since it uses less digits than its factorization.

27778055556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166753 (or 166751 counting only the distinct ones).

The product of its (nonzero) digits is 20580000, while the sum is 57.

It can be divided in two parts, 277780 and 55556, that added together give a triangular number (333336 = T₈₁₆).

The spelling of 27778055556 in words is "twenty-seven billion, seven hundred seventy-eight million, fifty-five thousand, five hundred fifty-six".