28319807 has 12 divisors (see below), whose sum is σ = 30765888. Its totient is φ = 25977600.

The previous prime is 28319789. The next prime is 28319813. The reversal of 28319807 is 70891382.

It is not a de Polignac number, because 28319807 - 2¹⁰ = 28318783 is a prime.

It is a super-2 number, since 2×28319807² = 1604022937034498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28319867) 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 11 ways as a sum of consecutive naturals, for example, 28082 + ... + 29072.

It is an arithmetic number, because the mean of its divisors is an integer number (2563824).

Almost surely, 2^28319807 is an apocalyptic number.

28319807 is a deficient number, since it is larger than the sum of its proper divisors (2446081).

28319807 is an equidigital number, since it uses as much as digits as its factorization.

28319807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28319807 is about 5321.6357447687. The cubic root of 28319807 is about 304.8106214854.

The spelling of 28319807 in words is "twenty-eight million, three hundred nineteen thousand, eight hundred seven".