28319994 has 48 divisors (see below), whose sum is σ = 68402880. Its totient is φ = 8415360.

The previous prime is 28319981. The next prime is 28320001. The reversal of 28319994 is 49991382.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3379 + ... + 8249.

It is an arithmetic number, because the mean of its divisors is an integer number (1425060).

Almost surely, 2^28319994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28319994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34201440).

28319994 is an abundant number, since it is smaller than the sum of its proper divisors (40082886).

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

28319994 is a wasteful number, since it uses less digits than its factorization.

28319994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4915 (or 4912 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 28319994 is about 5321.6533145255. The cubic root of 28319994 is about 304.8112923875.

The spelling of 28319994 in words is "twenty-eight million, three hundred nineteen thousand, nine hundred ninety-four".