27861321856 has 16 divisors (see below), whose sum is σ = 55504977390. Its totient is φ = 13930660864.

The previous prime is 27861321833. The next prime is 27861321857. The reversal of 27861321856 is 65812316872.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20701454400 + 7159867456 = 143880^2 + 84616^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (27861321857) by changing a digit.

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 as a sum of consecutive naturals, namely, 108833161 + ... + 108833416.

Almost surely, 2^27861321856 is an apocalyptic number.

It is an amenable number.

27861321856 is a deficient number, since it is larger than the sum of its proper divisors (27643655534).

27861321856 is an equidigital number, since it uses as much as digits as its factorization.

27861321856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217666591 (or 217666579 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The spelling of 27861321856 in words is "twenty-seven billion, eight hundred sixty-one million, three hundred twenty-one thousand, eight hundred fifty-six".