28968709 has 16 divisors (see below), whose sum is σ = 37365120. Its totient is φ = 21792960.

The previous prime is 28968703. The next prime is 28968739. The reversal of 28968709 is 90786982.

It is a happy number.

It is not a de Polignac number, because 28968709 - 2¹³ = 28960517 is a prime.

It is a super-2 number, since 2×28968709² = 1678372202253362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28968703) 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 15 ways as a sum of consecutive naturals, for example, 4254 + ... + 8719.

It is an arithmetic number, because the mean of its divisors is an integer number (2335320).

Almost surely, 2^28968709 is an apocalyptic number.

28968709 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28968709 is a deficient number, since it is larger than the sum of its proper divisors (8396411).

28968709 is a wasteful number, since it uses less digits than its factorization.

28968709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 28968709 is about 5382.2587265943. The cubic root of 28968709 is about 307.1211418061.

The spelling of 28968709 in words is "twenty-eight million, nine hundred sixty-eight thousand, seven hundred nine".