28030805 has 16 divisors (see below), whose sum is σ = 36993024. Its totient is φ = 20220480.

The previous prime is 28030801. The next prime is 28030811. The reversal of 28030805 is 50803082.

It is not a de Polignac number, because 28030805 - 2² = 28030801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28030801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4979 + ... + 8991.

It is an arithmetic number, because the mean of its divisors is an integer number (2312064).

Almost surely, 2^28030805 is an apocalyptic number.

It is an amenable number.

28030805 is a deficient number, since it is larger than the sum of its proper divisors (8962219).

28030805 is a wasteful number, since it uses less digits than its factorization.

28030805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 28030805 is about 5294.4126208674. The cubic root of 28030805 is about 303.7702160446.

Adding to 28030805 its reverse (50803082), we get a palindrome (78833887).

The spelling of 28030805 in words is "twenty-eight million, thirty thousand, eight hundred five".