28355999 has 8 divisors (see below), whose sum is σ = 34112640. Its totient is φ = 23025816.

The previous prime is 28355981. The next prime is 28356019. The reversal of 28355999 is 99955382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28355999 - 2¹⁶ = 28290463 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 (28355399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106469 + ... + 106734.

It is an arithmetic number, because the mean of its divisors is an integer number (4264080).

Almost surely, 2^28355999 is an apocalyptic number.

28355999 is a deficient number, since it is larger than the sum of its proper divisors (5756641).

28355999 is a wasteful number, since it uses less digits than its factorization.

28355999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213229.

The product of its digits is 874800, while the sum is 50.

The square root of 28355999 is about 5325.0351172551. The cubic root of 28355999 is about 304.9404129764.

The spelling of 28355999 in words is "twenty-eight million, three hundred fifty-five thousand, nine hundred ninety-nine".