28287394 has 8 divisors (see below), whose sum is σ = 43028928. Its totient is φ = 13944420.

The previous prime is 28287379. The next prime is 28287419. The reversal of 28287394 is 49378282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28287394² = 1600353318622472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28287394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99462 + ... + 99745.

It is an arithmetic number, because the mean of its divisors is an integer number (5378616).

Almost surely, 2^28287394 is an apocalyptic number.

28287394 is a deficient number, since it is larger than the sum of its proper divisors (14741534).

28287394 is a wasteful number, since it uses less digits than its factorization.

28287394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199280.

The product of its digits is 193536, while the sum is 43.

The square root of 28287394 is about 5318.5894746634. The cubic root of 28287394 is about 304.6942883204.

The spelling of 28287394 in words is "twenty-eight million, two hundred eighty-seven thousand, three hundred ninety-four".