28745819 has 2 divisors, whose sum is σ = 28745820. Its totient is φ = 28745818.

The previous prime is 28745779. The next prime is 28745831. The reversal of 28745819 is 91854782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28745819 - 2²⁴ = 11968603 is a prime.

It is a super-2 number, since 2×28745819² = 1652644219961522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28745819.

It is not a weakly prime, because it can be changed into another prime (28745839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14372909 + 14372910.

It is an arithmetic number, because the mean of its divisors is an integer number (14372910).

Almost surely, 2^28745819 is an apocalyptic number.

28745819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28745819 is an equidigital number, since it uses as much as digits as its factorization.

28745819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 28745819 is about 5361.5127529458. The cubic root of 28745819 is about 306.3314327944.

The spelling of 28745819 in words is "twenty-eight million, seven hundred forty-five thousand, eight hundred nineteen".