28812819 has 16 divisors (see below), whose sum is σ = 44023040. Its totient is φ = 16420320.

The previous prime is 28812799. The next prime is 28812821. The reversal of 28812819 is 91821882.

It is not a de Polignac number, because 28812819 - 2⁵ = 28812787 is a prime.

It is a super-2 number, since 2×28812819² = 1660357077453522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28812419) 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, 7212 + ... + 10470.

It is an arithmetic number, because the mean of its divisors is an integer number (2751440).

Almost surely, 2^28812819 is an apocalyptic number.

28812819 is a deficient number, since it is larger than the sum of its proper divisors (15210221).

28812819 is a wasteful number, since it uses less digits than its factorization.

28812819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690.

The product of its digits is 18432, while the sum is 39.

The square root of 28812819 is about 5367.7573529361. The cubic root of 28812819 is about 306.5692445477.

The spelling of 28812819 in words is "twenty-eight million, eight hundred twelve thousand, eight hundred nineteen".