27228321 has 6 divisors (see below), whose sum is σ = 39329810. Its totient is φ = 18152208.

The previous prime is 27228319. The next prime is 27228347. The reversal of 27228321 is 12382272.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18584721 + 8643600 = 4311^2 + 2940^2 .

It is not a de Polignac number, because 27228321 - 2¹ = 27228319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27228371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1512676 + ... + 1512693.

Almost surely, 2^27228321 is an apocalyptic number.

It is an amenable number.

27228321 is a deficient number, since it is larger than the sum of its proper divisors (12101489).

27228321 is a wasteful number, since it uses less digits than its factorization.

27228321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3025375 (or 3025372 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 27228321 is about 5218.0763696979. The cubic root of 27228321 is about 300.8432608165.

The spelling of 27228321 in words is "twenty-seven million, two hundred twenty-eight thousand, three hundred twenty-one".