27783555856 has 45 divisors (see below), whose sum is σ = 62629836021. Its totient is φ = 11905238016.

The previous prime is 27783555853. The next prime is 27783555887. The reversal of 27783555856 is 65855538772.

The square root of 27783555856 is 166684.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 232867600 + 27550688256 = 15260^2 + 165984^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27783555794 and 27783555803.

It is not an unprimeable number, because it can be changed into a prime (27783555853) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4664176 + ... + 4670128.

Almost surely, 2^27783555856 is an apocalyptic number.

27783555856 is the 166684-th square number.

It is an amenable number.

27783555856 is an abundant number, since it is smaller than the sum of its proper divisors (34846280165).

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

27783555856 is an frugal number, since it uses more digits than its factorization.

27783555856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11928 (or 5962 counting only the distinct ones).

The product of its digits is 70560000, while the sum is 61.

The spelling of 27783555856 in words is "twenty-seven billion, seven hundred eighty-three million, five hundred fifty-five thousand, eight hundred fifty-six".