28850805 has 12 divisors (see below), whose sum is σ = 50008140. Its totient is φ = 15387072.

The previous prime is 28850777. The next prime is 28850813. The reversal of 28850805 is 50805882.

It can be written as a sum of positive squares in 2 ways, for example, as 13593969 + 15256836 = 3687^2 + 3906^2 .

It is not a de Polignac number, because 28850805 - 2¹⁵ = 28818037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28850805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320520 + ... + 320609.

It is an arithmetic number, because the mean of its divisors is an integer number (4167345).

Almost surely, 2^28850805 is an apocalyptic number.

It is an amenable number.

28850805 is a deficient number, since it is larger than the sum of its proper divisors (21157335).

28850805 is a wasteful number, since it uses less digits than its factorization.

28850805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641140 (or 641137 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

The square root of 28850805 is about 5371.2945367016. The cubic root of 28850805 is about 306.7039094393.

The spelling of 28850805 in words is "twenty-eight million, eight hundred fifty thousand, eight hundred five".