28127999 has 16 divisors (see below), whose sum is σ = 31104000. Its totient is φ = 25331040.

The previous prime is 28127987. The next prime is 28128017. The reversal of 28127999 is 99972182.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28127999 - 2²⁴ = 11350783 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 (28127909) 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 15 ways as a sum of consecutive naturals, for example, 38762 + ... + 39480.

It is an arithmetic number, because the mean of its divisors is an integer number (1944000).

Almost surely, 2^28127999 is an apocalyptic number.

28127999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28127999 is a deficient number, since it is larger than the sum of its proper divisors (2976001).

28127999 is a wasteful number, since it uses less digits than its factorization.

28127999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838.

The product of its digits is 163296, while the sum is 47.

The square root of 28127999 is about 5303.5835997936. The cubic root of 28127999 is about 304.1209085938.

The spelling of 28127999 in words is "twenty-eight million, one hundred twenty-seven thousand, nine hundred ninety-nine".