27781147867 has 16 divisors (see below), whose sum is σ = 30906489600. Its totient is φ = 24758163040.

The previous prime is 27781147841. The next prime is 27781147871. The reversal of 27781147867 is 76874118772.

It is a cyclic number.

It is not a de Polignac number, because 27781147867 - 2⁷ = 27781147739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27781147367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173373 + ... + 292609.

It is an arithmetic number, because the mean of its divisors is an integer number (1931655600).

Almost surely, 2^27781147867 is an apocalyptic number.

27781147867 is a deficient number, since it is larger than the sum of its proper divisors (3125341733).

27781147867 is a wasteful number, since it uses less digits than its factorization.

27781147867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119666.

The product of its digits is 7375872, while the sum is 58.

The spelling of 27781147867 in words is "twenty-seven billion, seven hundred eighty-one million, one hundred forty-seven thousand, eight hundred sixty-seven".