28283947 has 4 divisors (see below), whose sum is σ = 29048416. Its totient is φ = 27519480.

The previous prime is 28283921. The next prime is 28283953. The reversal of 28283947 is 74938282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74938282 = 2 ⋅37469141.

It is a cyclic number.

It is not a de Polignac number, because 28283947 - 2¹⁹ = 27759659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28283987) 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, 382179 + ... + 382252.

It is an arithmetic number, because the mean of its divisors is an integer number (7262104).

Almost surely, 2^28283947 is an apocalyptic number.

28283947 is a deficient number, since it is larger than the sum of its proper divisors (764469).

28283947 is an equidigital number, since it uses as much as digits as its factorization.

28283947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764468.

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

The square root of 28283947 is about 5318.2654127074. The cubic root of 28283947 is about 304.6819115013.

The spelling of 28283947 in words is "twenty-eight million, two hundred eighty-three thousand, nine hundred forty-seven".