27721243 has 8 divisors (see below), whose sum is σ = 30283776. Its totient is φ = 25165800.

The previous prime is 27721241. The next prime is 27721259. The reversal of 27721243 is 34212772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27721243 - 2¹ = 27721241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27721241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9630 + ... + 12172.

It is an arithmetic number, because the mean of its divisors is an integer number (3785472).

Almost surely, 2^27721243 is an apocalyptic number.

27721243 is a deficient number, since it is larger than the sum of its proper divisors (2562533).

27721243 is a wasteful number, since it uses less digits than its factorization.

27721243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545.

The product of its digits is 4704, while the sum is 28.

The square root of 27721243 is about 5265.0966752758. The cubic root of 27721243 is about 302.6478315747.

The spelling of 27721243 in words is "twenty-seven million, seven hundred twenty-one thousand, two hundred forty-three".