28766819 has 2 divisors, whose sum is σ = 28766820. Its totient is φ = 28766818.

The previous prime is 28766783. The next prime is 28766827. The reversal of 28766819 is 91866782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28766819 is a prime.

It is a super-2 number, since 2×28766819² = 1655059750757522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28766119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14383409 + 14383410.

It is an arithmetic number, because the mean of its divisors is an integer number (14383410).

Almost surely, 2^28766819 is an apocalyptic number.

28766819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28766819 is an equidigital number, since it uses as much as digits as its factorization.

28766819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 28766819 is about 5363.4707979069. The cubic root of 28766819 is about 306.4060105293.

The spelling of 28766819 in words is "twenty-eight million, seven hundred sixty-six thousand, eight hundred nineteen".