27928999 has 4 divisors (see below), whose sum is σ = 31918864. Its totient is φ = 23939136.

The previous prime is 27928991. The next prime is 27929003. The reversal of 27928999 is 99982972.

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 27928999 - 2³ = 27928991 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 (27928991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994922 + ... + 1994935.

It is an arithmetic number, because the mean of its divisors is an integer number (7979716).

Almost surely, 2^27928999 is an apocalyptic number.

27928999 is a deficient number, since it is larger than the sum of its proper divisors (3989865).

27928999 is an equidigital number, since it uses as much as digits as its factorization.

27928999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3989864.

The product of its digits is 1469664, while the sum is 55.

The square root of 27928999 is about 5284.7893997774. The cubic root of 27928999 is about 303.4020122502.

The spelling of 27928999 in words is "twenty-seven million, nine hundred twenty-eight thousand, nine hundred ninety-nine".