28285347 has 4 divisors (see below), whose sum is σ = 37713800. Its totient is φ = 18856896.

The previous prime is 28285307. The next prime is 28285349. The reversal of 28285347 is 74358282.

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

It is not a de Polignac number, because 28285347 - 2¹⁴ = 28268963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28285349) 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, 4714222 + ... + 4714227.

It is an arithmetic number, because the mean of its divisors is an integer number (9428450).

Almost surely, 2^28285347 is an apocalyptic number.

28285347 is a deficient number, since it is larger than the sum of its proper divisors (9428453).

28285347 is an equidigital number, since it uses as much as digits as its factorization.

28285347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9428452.

The product of its digits is 107520, while the sum is 39.

The square root of 28285347 is about 5318.3970329414. The cubic root of 28285347 is about 304.6869384710.

The spelling of 28285347 in words is "twenty-eight million, two hundred eighty-five thousand, three hundred forty-seven".