28820163 has 4 divisors (see below), whose sum is σ = 38426888. Its totient is φ = 19213440.

The previous prime is 28820149. The next prime is 28820167. The reversal of 28820163 is 36102882.

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

It is not a de Polignac number, because 28820163 - 2¹⁴ = 28803779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28820163.

It is not an unprimeable number, because it can be changed into a prime (28820167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4803358 + ... + 4803363.

It is an arithmetic number, because the mean of its divisors is an integer number (9606722).

Almost surely, 2^28820163 is an apocalyptic number.

28820163 is a deficient number, since it is larger than the sum of its proper divisors (9606725).

28820163 is an equidigital number, since it uses as much as digits as its factorization.

28820163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9606724.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28820163 is about 5368.4413939243. The cubic root of 28820163 is about 306.5952891273.

The spelling of 28820163 in words is "twenty-eight million, eight hundred twenty thousand, one hundred sixty-three".