27781227 has 12 divisors (see below), whose sum is σ = 40192360. Its totient is φ = 18491328.

The previous prime is 27781223. The next prime is 27781241. The reversal of 27781227 is 72218772.

It is not a de Polignac number, because 27781227 - 2² = 27781223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27781191 and 27781200.

It is not an unprimeable number, because it can be changed into a prime (27781223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4563 + ... + 8739.

Almost surely, 2^27781227 is an apocalyptic number.

27781227 is a deficient number, since it is larger than the sum of its proper divisors (12411133).

27781227 is a wasteful number, since it uses less digits than its factorization.

27781227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922 (or 4919 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 27781227 is about 5270.7899787413. The cubic root of 27781227 is about 302.8659669253.

Adding to 27781227 its reverse (72218772), we get a palindrome (99999999).

It can be divided in two parts, 2778 and 1227, that added together give a triangular number (4005 = T₈₉).

The spelling of 27781227 in words is "twenty-seven million, seven hundred eighty-one thousand, two hundred twenty-seven".