28328805 has 32 divisors (see below), whose sum is σ = 50641920. Its totient is φ = 15024960.

The previous prime is 28328779. The next prime is 28328809. The reversal of 28328805 is 50882382.

It is not a de Polignac number, because 28328805 - 2¹⁶ = 28263269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28328805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29635 + ... + 30575.

It is an arithmetic number, because the mean of its divisors is an integer number (1582560).

Almost surely, 2^28328805 is an apocalyptic number.

It is an amenable number.

28328805 is a deficient number, since it is larger than the sum of its proper divisors (22313115).

28328805 is a wasteful number, since it uses less digits than its factorization.

28328805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28328805 is about 5322.4810943769. The cubic root of 28328805 is about 304.8429003723.

The spelling of 28328805 in words is "twenty-eight million, three hundred twenty-eight thousand, eight hundred five".