27742321 has 4 divisors (see below), whose sum is σ = 27764644. Its totient is φ = 27720000.

The previous prime is 27742259. The next prime is 27742343. The reversal of 27742321 is 12324772.

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 16719921 + 11022400 = 4089^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 27742321 - 2¹⁹ = 27218033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27742321.

It is not an unprimeable number, because it can be changed into a prime (27742021) 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, 9180 + ... + 11821.

It is an arithmetic number, because the mean of its divisors is an integer number (6941161).

Almost surely, 2^27742321 is an apocalyptic number.

It is an amenable number.

27742321 is a deficient number, since it is larger than the sum of its proper divisors (22323).

27742321 is a wasteful number, since it uses less digits than its factorization.

27742321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22322.

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

The square root of 27742321 is about 5267.0979675719. The cubic root of 27742321 is about 302.7245187908.

The spelling of 27742321 in words is "twenty-seven million, seven hundred forty-two thousand, three hundred twenty-one".