28143799 has 4 divisors (see below), whose sum is σ = 28156680. Its totient is φ = 28130920.

The previous prime is 28143793. The next prime is 28143809. The reversal of 28143799 is 99734182.

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 28143799 - 2⁹ = 28143287 is a prime.

It is a super-3 number, since 3×28143799³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28143793) 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, 2257 + ... + 7834.

It is an arithmetic number, because the mean of its divisors is an integer number (7039170).

Almost surely, 2^28143799 is an apocalyptic number.

28143799 is a deficient number, since it is larger than the sum of its proper divisors (12881).

28143799 is a wasteful number, since it uses less digits than its factorization.

28143799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12880.

The product of its digits is 108864, while the sum is 43.

The square root of 28143799 is about 5305.0729495456. The cubic root of 28143799 is about 304.1778413192.

The spelling of 28143799 in words is "twenty-eight million, one hundred forty-three thousand, seven hundred ninety-nine".