27768862321 has 4 divisors (see below), whose sum is σ = 28080872100. Its totient is φ = 27456852544.

The previous prime is 27768862309. The next prime is 27768862357. The reversal of 27768862321 is 12326886772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4364452096 + 23404410225 = 66064^2 + 152985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27768862321 is a prime.

It is a super-2 number, since 2×27768862321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27768862421) 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, 156004756 + ... + 156004933.

It is an arithmetic number, because the mean of its divisors is an integer number (7020218025).

Almost surely, 2^27768862321 is an apocalyptic number.

It is an amenable number.

27768862321 is a deficient number, since it is larger than the sum of its proper divisors (312009779).

27768862321 is an equidigital number, since it uses as much as digits as its factorization.

27768862321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312009778.

The product of its digits is 2709504, while the sum is 52.

The spelling of 27768862321 in words is "twenty-seven billion, seven hundred sixty-eight million, eight hundred sixty-two thousand, three hundred twenty-one".