27748881 has 6 divisors (see below), whose sum is σ = 40081730. Its totient is φ = 18499248.

The previous prime is 27748871. The next prime is 27748883. The reversal of 27748881 is 18884772.

Added to its reverse (18884772) it gives a triangular number (46633653 = T₉₆₅₇).

It can be written as a sum of positive squares in only one way, i.e., 26780625 + 968256 = 5175^2 + 984^2 .

It is not a de Polignac number, because 27748881 - 2⁵ = 27748849 is a prime.

It is a super-2 number, since 2×27748881² = 1540000793504322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27748883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1541596 + ... + 1541613.

Almost surely, 2^27748881 is an apocalyptic number.

It is an amenable number.

27748881 is a deficient number, since it is larger than the sum of its proper divisors (12332849).

27748881 is a wasteful number, since it uses less digits than its factorization.

27748881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083215 (or 3083212 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 27748881 is about 5267.7206645759. The cubic root of 27748881 is about 302.7483778416.

Adding to 27748881 its reverse (18884772), we get a triangular number (46633653 = T₉₆₅₇).

The spelling of 27748881 in words is "twenty-seven million, seven hundred forty-eight thousand, eight hundred eighty-one".