27827991 has 12 divisors (see below), whose sum is σ = 40681368. Its totient is φ = 18327984.

The previous prime is 27827977. The next prime is 27827993. The reversal of 27827991 is 19972872.

It is not a de Polignac number, because 27827991 - 2¹⁵ = 27795223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27827993) 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, 17880 + ... + 19373.

It is an arithmetic number, because the mean of its divisors is an integer number (3390114).

Almost surely, 2^27827991 is an apocalyptic number.

27827991 is a deficient number, since it is larger than the sum of its proper divisors (12853377).

27827991 is a wasteful number, since it uses less digits than its factorization.

27827991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37342 (or 37339 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 27827991 is about 5275.2242606358. The cubic root of 27827991 is about 303.0358092502.

The spelling of 27827991 in words is "twenty-seven million, eight hundred twenty-seven thousand, nine hundred ninety-one".