28264219 has 4 divisors (see below), whose sum is σ = 29176000. Its totient is φ = 27352440.

The previous prime is 28264207. The next prime is 28264237. The reversal of 28264219 is 91246282.

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 28264219 - 2⁷ = 28264091 is a prime.

It is a super-2 number, since 2×28264219² = 1597732151359922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28264519) 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, 455844 + ... + 455905.

It is an arithmetic number, because the mean of its divisors is an integer number (7294000).

Almost surely, 2^28264219 is an apocalyptic number.

28264219 is a deficient number, since it is larger than the sum of its proper divisors (911781).

28264219 is an equidigital number, since it uses as much as digits as its factorization.

28264219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911780.

The product of its digits is 13824, while the sum is 34.

The square root of 28264219 is about 5316.4103490983. The cubic root of 28264219 is about 304.6110566710.

It can be divided in two parts, 28264 and 219, that multiplied together give a palindrome (6189816).

The spelling of 28264219 in words is "twenty-eight million, two hundred sixty-four thousand, two hundred nineteen".