28442811 has 4 divisors (see below), whose sum is σ = 37923752. Its totient is φ = 18961872.

The previous prime is 28442809. The next prime is 28442831. The reversal of 28442811 is 11824482.

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

It is not a de Polignac number, because 28442811 - 2¹ = 28442809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28442831) 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 3 ways as a sum of consecutive naturals, for example, 4740466 + ... + 4740471.

It is an arithmetic number, because the mean of its divisors is an integer number (9480938).

Almost surely, 2^28442811 is an apocalyptic number.

28442811 is a deficient number, since it is larger than the sum of its proper divisors (9480941).

28442811 is an equidigital number, since it uses as much as digits as its factorization.

28442811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480940.

The product of its digits is 4096, while the sum is 30.

The square root of 28442811 is about 5333.1801957181. The cubic root of 28442811 is about 305.2512880260.

The spelling of 28442811 in words is "twenty-eight million, four hundred forty-two thousand, eight hundred eleven".