27997311 has 16 divisors (see below), whose sum is σ = 38021760. Its totient is φ = 18322080.

The previous prime is 27997297. The next prime is 27997313. The reversal of 27997311 is 11379972.

It is not a de Polignac number, because 27997311 - 2⁹ = 27996799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27997311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56776 + ... + 57266.

It is an arithmetic number, because the mean of its divisors is an integer number (2376360).

Almost surely, 2^27997311 is an apocalyptic number.

27997311 is a deficient number, since it is larger than the sum of its proper divisors (10024449).

27997311 is a wasteful number, since it uses less digits than its factorization.

27997311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806.

The product of its digits is 23814, while the sum is 39.

The square root of 27997311 is about 5291.2485294116. The cubic root of 27997311 is about 303.6491761767.

It can be divided in two parts, 279973 and 11, that multiplied together give a palindrome (3079703).

The spelling of 27997311 in words is "twenty-seven million, nine hundred ninety-seven thousand, three hundred eleven".