27963891 has 24 divisors (see below), whose sum is σ = 42297216. Its totient is φ = 17781120.

The previous prime is 27963863. The next prime is 27963907. The reversal of 27963891 is 19836972.

27963891 is a `hidden beast` number, since 2 + 7 + 9 + 638 + 9 + 1 = 666.

It is not a de Polignac number, because 27963891 - 2¹³ = 27955699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27963851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19681 + ... + 21053.

It is an arithmetic number, because the mean of its divisors is an integer number (1762384).

Almost surely, 2^27963891 is an apocalyptic number.

27963891 is a deficient number, since it is larger than the sum of its proper divisors (14333325).

27963891 is a wasteful number, since it uses less digits than its factorization.

27963891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483 (or 1480 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 27963891 is about 5288.0895416020. The cubic root of 27963891 is about 303.5283074741.

The spelling of 27963891 in words is "twenty-seven million, nine hundred sixty-three thousand, eight hundred ninety-one".