27720427 has 6 divisors (see below), whose sum is σ = 32246268. Its totient is φ = 23760324.

The previous prime is 27720419. The next prime is 27720467. The reversal of 27720427 is 72402772.

It is not a de Polignac number, because 27720427 - 2³ = 27720419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27720467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282813 + ... + 282910.

It is an arithmetic number, because the mean of its divisors is an integer number (5374378).

Almost surely, 2^27720427 is an apocalyptic number.

27720427 is a deficient number, since it is larger than the sum of its proper divisors (4525841).

27720427 is an equidigital number, since it uses as much as digits as its factorization.

27720427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565737 (or 565730 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 31.

The square root of 27720427 is about 5265.0191832509. The cubic root of 27720427 is about 302.6448619742.

The spelling of 27720427 in words is "twenty-seven million, seven hundred twenty thousand, four hundred twenty-seven".