28814789 has 2 divisors, whose sum is σ = 28814790. Its totient is φ = 28814788.

The previous prime is 28814783. The next prime is 28814809. The reversal of 28814789 is 98741882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23136100 + 5678689 = 4810^2 + 2383^2 .

It is a cyclic number.

It is not a de Polignac number, because 28814789 - 2¹² = 28810693 is a prime.

It is a super-2 number, since 2×28814789² = 1660584130229042, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1788878 and since 28814789 and 1788878 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28814783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14407394 + 14407395.

It is an arithmetic number, because the mean of its divisors is an integer number (14407395).

Almost surely, 2^28814789 is an apocalyptic number.

It is an amenable number.

28814789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28814789 is an equidigital number, since it uses as much as digits as its factorization.

28814789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 47.

The square root of 28814789 is about 5367.9408528783. The cubic root of 28814789 is about 306.5762313412.

The spelling of 28814789 in words is "twenty-eight million, eight hundred fourteen thousand, seven hundred eighty-nine".