28770829 has 4 divisors (see below), whose sum is σ = 28845180. Its totient is φ = 28696480.

The previous prime is 28770799. The next prime is 28770839. The reversal of 28770829 is 92807782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92807782 = 2 ⋅46403891.

It can be written as a sum of positive squares in 2 ways, for example, as 17413929 + 11356900 = 4173^2 + 3370^2 .

It is a cyclic number.

It is not a de Polignac number, because 28770829 - 2¹⁷ = 28639757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28770839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36592 + ... + 37369.

It is an arithmetic number, because the mean of its divisors is an integer number (7211295).

Almost surely, 2^28770829 is an apocalyptic number.

It is an amenable number.

28770829 is a deficient number, since it is larger than the sum of its proper divisors (74351).

28770829 is an equidigital number, since it uses as much as digits as its factorization.

28770829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74350.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 28770829 is about 5363.8446099789. The cubic root of 28770829 is about 306.4202471980.

The spelling of 28770829 in words is "twenty-eight million, seven hundred seventy thousand, eight hundred twenty-nine".