27928331 has 4 divisors (see below), whose sum is σ = 29571192. Its totient is φ = 26285472.

The previous prime is 27928319. The next prime is 27928349. The reversal of 27928331 is 13382972.

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

It is a cyclic number.

It is not a de Polignac number, because 27928331 - 2¹⁰ = 27927307 is a prime.

It is a super-2 number, since 2×27928331² = 1559983344891122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27928291 and 27928300.

It is not an unprimeable number, because it can be changed into a prime (27928361) 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, 821405 + ... + 821438.

It is an arithmetic number, because the mean of its divisors is an integer number (7392798).

Almost surely, 2^27928331 is an apocalyptic number.

27928331 is a deficient number, since it is larger than the sum of its proper divisors (1642861).

27928331 is a wasteful number, since it uses less digits than its factorization.

27928331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642860.

The product of its digits is 18144, while the sum is 35.

The square root of 27928331 is about 5284.7261991517. The cubic root of 27928331 is about 303.3995933288.

The spelling of 27928331 in words is "twenty-seven million, nine hundred twenty-eight thousand, three hundred thirty-one".