27720393 has 4 divisors (see below), whose sum is σ = 36960528. Its totient is φ = 18480260.

The previous prime is 27720377. The next prime is 27720401. The reversal of 27720393 is 39302772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27720393 - 2⁴ = 27720377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27720323) 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, 4620063 + ... + 4620068.

It is an arithmetic number, because the mean of its divisors is an integer number (9240132).

Almost surely, 2^27720393 is an apocalyptic number.

It is an amenable number.

27720393 is a deficient number, since it is larger than the sum of its proper divisors (9240135).

27720393 is an equidigital number, since it uses as much as digits as its factorization.

27720393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240134.

The product of its (nonzero) digits is 15876, while the sum is 33.

The square root of 27720393 is about 5265.0159543918. The cubic root of 27720393 is about 302.6447382396.

The spelling of 27720393 in words is "twenty-seven million, seven hundred twenty thousand, three hundred ninety-three".