28020843 has 16 divisors (see below), whose sum is σ = 41604640. Its totient is φ = 18639072.

The previous prime is 28020827. The next prime is 28020847. The reversal of 28020843 is 34802082.

It is not a de Polignac number, because 28020843 - 2⁴ = 28020827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28020847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15705 + ... + 17397.

It is an arithmetic number, because the mean of its divisors is an integer number (2600290).

Almost surely, 2^28020843 is an apocalyptic number.

28020843 is a deficient number, since it is larger than the sum of its proper divisors (13583797).

28020843 is a wasteful number, since it uses less digits than its factorization.

28020843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315 (or 2309 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28020843 is about 5293.4717341269. The cubic root of 28020843 is about 303.7342256707.

The spelling of 28020843 in words is "twenty-eight million, twenty thousand, eight hundred forty-three".