28361999 has 4 divisors (see below), whose sum is σ = 28373136. Its totient is φ = 28350864.

The previous prime is 28361953. The next prime is 28362023. The reversal of 28361999 is 99916382.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28361999 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 (28321999) 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, 347 + ... + 7539.

It is an arithmetic number, because the mean of its divisors is an integer number (7093284).

Almost surely, 2^28361999 is an apocalyptic number.

28361999 is a deficient number, since it is larger than the sum of its proper divisors (11137).

28361999 is an equidigital number, since it uses as much as digits as its factorization.

28361999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11136.

The product of its digits is 209952, while the sum is 47.

The square root of 28361999 is about 5325.5984640226. The cubic root of 28361999 is about 304.9619194596.

The spelling of 28361999 in words is "twenty-eight million, three hundred sixty-one thousand, nine hundred ninety-nine".