28321347 has 4 divisors (see below), whose sum is σ = 37761800. Its totient is φ = 18880896.

The previous prime is 28321339. The next prime is 28321367. The reversal of 28321347 is 74312382.

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

It is not a de Polignac number, because 28321347 - 2³ = 28321339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28321367) 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, 4720222 + ... + 4720227.

It is an arithmetic number, because the mean of its divisors is an integer number (9440450).

Almost surely, 2^28321347 is an apocalyptic number.

28321347 is a deficient number, since it is larger than the sum of its proper divisors (9440453).

28321347 is an equidigital number, since it uses as much as digits as its factorization.

28321347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9440452.

The product of its digits is 8064, while the sum is 30.

The square root of 28321347 is about 5321.7804351551. The cubic root of 28321347 is about 304.8161464742.

The spelling of 28321347 in words is "twenty-eight million, three hundred twenty-one thousand, three hundred forty-seven".