28328567 has 4 divisors (see below), whose sum is σ = 28398240. Its totient is φ = 28258896.

The previous prime is 28328551. The next prime is 28328591. The reversal of 28328567 is 76582382.

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

It is a cyclic number.

It is not a de Polignac number, because 28328567 - 2⁴ = 28328551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328527) 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, 34223 + ... + 35040.

It is an arithmetic number, because the mean of its divisors is an integer number (7099560).

Almost surely, 2^28328567 is an apocalyptic number.

28328567 is a deficient number, since it is larger than the sum of its proper divisors (69673).

28328567 is an equidigital number, since it uses as much as digits as its factorization.

28328567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69672.

The product of its digits is 161280, while the sum is 41.

The square root of 28328567 is about 5322.4587363361. The cubic root of 28328567 is about 304.8420466734.

The spelling of 28328567 in words is "twenty-eight million, three hundred twenty-eight thousand, five hundred sixty-seven".