28855399 has 4 divisors (see below), whose sum is σ = 28874664. Its totient is φ = 28836136.

The previous prime is 28855391. The next prime is 28855403. The reversal of 28855399 is 99355882.

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 28855399 - 2³ = 28855391 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 (28855391) 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, 7177 + ... + 10450.

It is an arithmetic number, because the mean of its divisors is an integer number (7218666).

Almost surely, 2^28855399 is an apocalyptic number.

28855399 is a deficient number, since it is larger than the sum of its proper divisors (19265).

28855399 is a wasteful number, since it uses less digits than its factorization.

28855399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19264.

The product of its digits is 777600, while the sum is 49.

The square root of 28855399 is about 5371.7221633290. The cubic root of 28855399 is about 306.7201877024.

The spelling of 28855399 in words is "twenty-eight million, eight hundred fifty-five thousand, three hundred ninety-nine".