28517994 has 24 divisors (see below), whose sum is σ = 64078560. Its totient is φ = 9505836.

The previous prime is 28517989. The next prime is 28518013. The reversal of 28517994 is 49971582.

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 28854 + ... + 29825.

It is an arithmetic number, because the mean of its divisors is an integer number (2669940).

Almost surely, 2^28517994 is an apocalyptic number.

28517994 is an abundant number, since it is smaller than the sum of its proper divisors (35560566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28517994 is an equidigital number, since it uses as much as digits as its factorization.

28517994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58696 (or 58684 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 28517994 is about 5340.2241525988. The cubic root of 28517994 is about 305.5200087255.

The spelling of 28517994 in words is "twenty-eight million, five hundred seventeen thousand, nine hundred ninety-four".