27728079 has 4 divisors (see below), whose sum is σ = 36970776. Its totient is φ = 18485384.

The previous prime is 27728069. The next prime is 27728081. The reversal of 27728079 is 97082772.

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 27728079 - 2⁵ = 27728047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27728079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728069) 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, 4621344 + ... + 4621349.

It is an arithmetic number, because the mean of its divisors is an integer number (9242694).

Almost surely, 2^27728079 is an apocalyptic number.

27728079 is a deficient number, since it is larger than the sum of its proper divisors (9242697).

27728079 is an equidigital number, since it uses as much as digits as its factorization.

27728079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9242696.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 27728079 is about 5265.7458161214. The cubic root of 27728079 is about 302.6727069689.

The spelling of 27728079 in words is "twenty-seven million, seven hundred twenty-eight thousand, seventy-nine".