28286338 has 4 divisors (see below), whose sum is σ = 42429510. Its totient is φ = 14143168.

The previous prime is 28286299. The next prime is 28286341. The reversal of 28286338 is 83368282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83368282 = 2 ⋅41684141.

It can be written as a sum of positive squares in only one way, i.e., 23590449 + 4695889 = 4857^2 + 2167^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28286338.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7071583 + ... + 7071586.

Almost surely, 2^28286338 is an apocalyptic number.

28286338 is a deficient number, since it is larger than the sum of its proper divisors (14143172).

28286338 is a wasteful number, since it uses less digits than its factorization.

28286338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14143171.

The product of its digits is 110592, while the sum is 40.

The square root of 28286338 is about 5318.4901992953. The cubic root of 28286338 is about 304.6904967472.

The spelling of 28286338 in words is "twenty-eight million, two hundred eighty-six thousand, three hundred thirty-eight".