28283219 has 4 divisors (see below), whose sum is σ = 28296480. Its totient is φ = 28269960.

The previous prime is 28283209. The next prime is 28283231. The reversal of 28283219 is 91238282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28283219 is a prime.

It is a super-2 number, since 2×28283219² = 1599880954003922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28283209) 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, 2624 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (7074120).

Almost surely, 2^28283219 is an apocalyptic number.

28283219 is a deficient number, since it is larger than the sum of its proper divisors (13261).

28283219 is a wasteful number, since it uses less digits than its factorization.

28283219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13260.

The product of its digits is 13824, while the sum is 35.

The square root of 28283219 is about 5318.1969688984. The cubic root of 28283219 is about 304.6792974114.

The spelling of 28283219 in words is "twenty-eight million, two hundred eighty-three thousand, two hundred nineteen".