28831805 has 4 divisors (see below), whose sum is σ = 34598172. Its totient is φ = 23065440.

The previous prime is 28831783. The next prime is 28831819. The reversal of 28831805 is 50813882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 21335161 = 2738^2 + 4619^2 .

It is not a de Polignac number, because 28831805 - 2¹² = 28827709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883176 + ... + 2883185.

It is an arithmetic number, because the mean of its divisors is an integer number (8649543).

Almost surely, 2^28831805 is an apocalyptic number.

It is an amenable number.

28831805 is a deficient number, since it is larger than the sum of its proper divisors (5766367).

28831805 is an equidigital number, since it uses as much as digits as its factorization.

28831805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5766366.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 28831805 is about 5369.5255842579. The cubic root of 28831805 is about 306.6365669628.

The spelling of 28831805 in words is "twenty-eight million, eight hundred thirty-one thousand, eight hundred five".