27997291 has 8 divisors (see below), whose sum is σ = 32060384. Its totient is φ = 23950080.

The previous prime is 27997259. The next prime is 27997297. The reversal of 27997291 is 19279972.

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

It is not a de Polignac number, because 27997291 - 2⁵ = 27997259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27997297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91 + ... + 7483.

It is an arithmetic number, because the mean of its divisors is an integer number (4007548).

Almost surely, 2^27997291 is an apocalyptic number.

27997291 is a deficient number, since it is larger than the sum of its proper divisors (4063093).

27997291 is an equidigital number, since it uses as much as digits as its factorization.

27997291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7941.

The product of its digits is 142884, while the sum is 46.

The square root of 27997291 is about 5291.2466394981. The cubic root of 27997291 is about 303.6491038723.

It can be divided in two parts, 279972 and 91, that multiplied together give a palindrome (25477452).

The spelling of 27997291 in words is "twenty-seven million, nine hundred ninety-seven thousand, two hundred ninety-one".