28987199 has 8 divisors (see below), whose sum is σ = 30468480. Its totient is φ = 27524376.

The previous prime is 28987183. The next prime is 28987207. The reversal of 28987199 is 99178982.

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

It is not a de Polignac number, because 28987199 - 2⁴ = 28987183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28987199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28987129) 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 7 ways as a sum of consecutive naturals, for example, 1337 + ... + 7730.

It is an arithmetic number, because the mean of its divisors is an integer number (3808560).

Almost surely, 2^28987199 is an apocalyptic number.

28987199 is a deficient number, since it is larger than the sum of its proper divisors (1481281).

28987199 is a wasteful number, since it uses less digits than its factorization.

28987199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9229.

The product of its digits is 653184, while the sum is 53.

The square root of 28987199 is about 5383.9761329337. The cubic root of 28987199 is about 307.1864704814.

The spelling of 28987199 in words is "twenty-eight million, nine hundred eighty-seven thousand, one hundred ninety-nine".