28783226 has 4 divisors (see below), whose sum is σ = 43174842. Its totient is φ = 14391612.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783226 is 62238782.

It is a Cunningham number, because it is equal to 5365²+1.

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

It can be written as a sum of positive squares in only one way, i.e., 28783225 + 1 = 5365^2 + 1^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28783226.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7195805 + ... + 7195808.

Almost surely, 2^28783226 is an apocalyptic number.

28783226 is a deficient number, since it is larger than the sum of its proper divisors (14391616).

28783226 is a wasteful number, since it uses less digits than its factorization.

28783226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14391615.

The product of its digits is 64512, while the sum is 38.

The square root of 28783226 is about 5365.0000931966. Note that the first 4 decimals coincide. The cubic root of 28783226 is about 306.4642517965.

The spelling of 28783226 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred twenty-six".