28842021 has 16 divisors (see below), whose sum is σ = 46016320. Its totient is φ = 17748720.

The previous prime is 28842001. The next prime is 28842043. The reversal of 28842021 is 12024882.

It is not a de Polignac number, because 28842021 - 2¹⁷ = 28710949 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28842001) 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, 40735 + ... + 41436.

It is an arithmetic number, because the mean of its divisors is an integer number (2876020).

Almost surely, 2^28842021 is an apocalyptic number.

It is an amenable number.

28842021 is a deficient number, since it is larger than the sum of its proper divisors (17174299).

28842021 is a wasteful number, since it uses less digits than its factorization.

28842021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82193 (or 82187 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28842021 is about 5370.4767944755. The cubic root of 28842021 is about 306.6727796250.

The spelling of 28842021 in words is "twenty-eight million, eight hundred forty-two thousand, twenty-one".