28842709 has 8 divisors (see below), whose sum is σ = 33004928. Its totient is φ = 24690960.

The previous prime is 28842707. The next prime is 28842731. The reversal of 28842709 is 90724882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28842709 - 2¹ = 28842707 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 (28842701) 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 in 7 ways as a sum of consecutive naturals, for example, 4639 + ... + 8899.

It is an arithmetic number, because the mean of its divisors is an integer number (4125616).

Almost surely, 2^28842709 is an apocalyptic number.

It is an amenable number.

28842709 is a deficient number, since it is larger than the sum of its proper divisors (4162219).

28842709 is an equidigital number, since it uses as much as digits as its factorization.

28842709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5235.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28842709 is about 5370.5408479966. The cubic root of 28842709 is about 306.6752180718.

The spelling of 28842709 in words is "twenty-eight million, eight hundred forty-two thousand, seven hundred nine".