27768321 has 24 divisors (see below), whose sum is σ = 46002944. Its totient is φ = 15811200.

The previous prime is 27768317. The next prime is 27768347. The reversal of 27768321 is 12386772.

27768321 is a `hidden beast` number, since 277 + 68 + 321 = 666.

It is not a de Polignac number, because 27768321 - 2² = 27768317 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 (27768371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22521 + ... + 23721.

Almost surely, 2^27768321 is an apocalyptic number.

27768321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27768321 is a deficient number, since it is larger than the sum of its proper divisors (18234623).

27768321 is a wasteful number, since it uses less digits than its factorization.

27768321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1578 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 27768321 is about 5269.5655418640. The cubic root of 27768321 is about 302.8190600265.

The spelling of 27768321 in words is "twenty-seven million, seven hundred sixty-eight thousand, three hundred twenty-one".