27956991 has 8 divisors (see below), whose sum is σ = 37606320. Its totient is φ = 18472832.

The previous prime is 27956989. The next prime is 27957001. The reversal of 27956991 is 19965972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27956991 - 2¹ = 27956989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27956991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27956911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40896 + ... + 41573.

It is an arithmetic number, because the mean of its divisors is an integer number (4700790).

Almost surely, 2^27956991 is an apocalyptic number.

27956991 is a deficient number, since it is larger than the sum of its proper divisors (9649329).

27956991 is a wasteful number, since it uses less digits than its factorization.

27956991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82585.

The product of its digits is 306180, while the sum is 48.

The square root of 27956991 is about 5287.4370918244. The cubic root of 27956991 is about 303.5033405432.

The spelling of 27956991 in words is "twenty-seven million, nine hundred fifty-six thousand, nine hundred ninety-one".