28206819 has 8 divisors (see below), whose sum is σ = 41787920. Its totient is φ = 18804528.

The previous prime is 28206797. The next prime is 28206877. The reversal of 28206819 is 91860282.

It is not a de Polignac number, because 28206819 - 2¹⁹ = 27682531 is a prime.

It is a super-2 number, since 2×28206819² = 1591249276197522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28206889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522322 + ... + 522375.

It is an arithmetic number, because the mean of its divisors is an integer number (5223490).

Almost surely, 2^28206819 is an apocalyptic number.

28206819 is a deficient number, since it is larger than the sum of its proper divisors (13581101).

28206819 is a wasteful number, since it uses less digits than its factorization.

28206819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044706 (or 1044700 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28206819 is about 5311.0092261264. The cubic root of 28206819 is about 304.4047118669.

The spelling of 28206819 in words is "twenty-eight million, two hundred six thousand, eight hundred nineteen".