27026991 has 18 divisors (see below), whose sum is σ = 41474472. Its totient is φ = 16956480.

The previous prime is 27026977. The next prime is 27027019. The reversal of 27026991 is 19962072.

It is not a de Polignac number, because 27026991 - 2⁵ = 27026959 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27026921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2595 + ... + 7796.

Almost surely, 2^27026991 is an apocalyptic number.

27026991 is a deficient number, since it is larger than the sum of its proper divisors (14447481).

27026991 is a wasteful number, since it uses less digits than its factorization.

27026991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10431 (or 10411 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 27026991 is about 5198.7489841307. The cubic root of 27026991 is about 300.0999333740.

It can be divided in two parts, 270 and 26991, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 27026991 in words is "twenty-seven million, twenty-six thousand, nine hundred ninety-one".