27781983 has 12 divisors (see below), whose sum is σ = 41424448. Its totient is φ = 17923680.

The previous prime is 27781939. The next prime is 27781987. The reversal of 27781983 is 38918772.

It is not a de Polignac number, because 27781983 - 2⁹ = 27781471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27781987) 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, 49510 + ... + 50067.

Almost surely, 2^27781983 is an apocalyptic number.

27781983 is a deficient number, since it is larger than the sum of its proper divisors (13642465).

27781983 is a wasteful number, since it uses less digits than its factorization.

27781983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99614 (or 99611 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 27781983 is about 5270.8616942583. The cubic root of 27781983 is about 302.8687141593.

It can be divided in two parts, 2778 and 1983, that added together give a square (4761 = 69²).

The spelling of 27781983 in words is "twenty-seven million, seven hundred eighty-one thousand, nine hundred eighty-three".