27740321 has 12 divisors (see below), whose sum is σ = 32637060. Its totient is φ = 23506560.

The previous prime is 27740309. The next prime is 27740333. The reversal of 27740321 is 12304772.

It is an interprime number because it is at equal distance from previous prime (27740309) and next prime (27740333).

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 21669025 = 2464^2 + 4655^2 .

It is not a de Polignac number, because 27740321 - 2¹⁸ = 27478177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27740341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1181 + ... + 7541.

It is an arithmetic number, because the mean of its divisors is an integer number (2719755).

Almost surely, 2^27740321 is an apocalyptic number.

It is an amenable number.

27740321 is a deficient number, since it is larger than the sum of its proper divisors (4896739).

27740321 is an equidigital number, since it uses as much as digits as its factorization.

27740321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6464 (or 6457 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 27740321 is about 5266.9081062802. The cubic root of 27740321 is about 302.7172439418.

The spelling of 27740321 in words is "twenty-seven million, seven hundred forty thousand, three hundred twenty-one".