27720343 has 4 divisors (see below), whose sum is σ = 31680400. Its totient is φ = 23760288.

The previous prime is 27720323. The next prime is 27720347. The reversal of 27720343 is 34302772.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27720343 - 2⁵ = 27720311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27720347) 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, 1980018 + ... + 1980031.

It is an arithmetic number, because the mean of its divisors is an integer number (7920100).

Almost surely, 2^27720343 is an apocalyptic number.

27720343 is a deficient number, since it is larger than the sum of its proper divisors (3960057).

27720343 is an equidigital number, since it uses as much as digits as its factorization.

27720343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960056.

The product of its (nonzero) digits is 7056, while the sum is 28.

The square root of 27720343 is about 5265.0112060659. The cubic root of 27720343 is about 302.6445562767.

The spelling of 27720343 in words is "twenty-seven million, seven hundred twenty thousand, three hundred forty-three".