27978233 has 4 divisors (see below), whose sum is σ = 27993588. Its totient is φ = 27962880.

The previous prime is 27978193. The next prime is 27978239. The reversal of 27978233 is 33287972.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13446889 + 14531344 = 3667^2 + 3812^2 .

It is a cyclic number.

It is not a de Polignac number, because 27978233 - 2⁶ = 27978169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27978239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4508 + ... + 8733.

It is an arithmetic number, because the mean of its divisors is an integer number (6998397).

Almost surely, 2^27978233 is an apocalyptic number.

It is an amenable number.

27978233 is a deficient number, since it is larger than the sum of its proper divisors (15355).

27978233 is a wasteful number, since it uses less digits than its factorization.

27978233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15354.

The product of its digits is 127008, while the sum is 41.

The square root of 27978233 is about 5289.4454340696. The cubic root of 27978233 is about 303.5801893692.

The spelling of 27978233 in words is "twenty-seven million, nine hundred seventy-eight thousand, two hundred thirty-three".