28328947 has 8 divisors (see below), whose sum is σ = 29547392. Its totient is φ = 27129600.

The previous prime is 28328941. The next prime is 28329011. The reversal of 28328947 is 74982382.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28328947 - 2⁷ = 28328819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28328941) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1704 + ... + 7717.

It is an arithmetic number, because the mean of its divisors is an integer number (3693424).

Almost surely, 2^28328947 is an apocalyptic number.

28328947 is a deficient number, since it is larger than the sum of its proper divisors (1218445).

28328947 is an equidigital number, since it uses as much as digits as its factorization.

28328947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549.

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

The square root of 28328947 is about 5322.4944340037. The cubic root of 28328947 is about 304.8434097199.

The spelling of 28328947 in words is "twenty-eight million, three hundred twenty-eight thousand, nine hundred forty-seven".