28967309 has 8 divisors (see below), whose sum is σ = 33730560. Its totient is φ = 24360336.

The previous prime is 28967297. The next prime is 28967311. The reversal of 28967309 is 90376982.

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

It is not a de Polignac number, because 28967309 - 2¹² = 28963213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28967309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28967399) 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 7 ways as a sum of consecutive naturals, for example, 38669 + ... + 39410.

It is an arithmetic number, because the mean of its divisors is an integer number (4216320).

Almost surely, 2^28967309 is an apocalyptic number.

It is an amenable number.

28967309 is a deficient number, since it is larger than the sum of its proper divisors (4763251).

28967309 is an equidigital number, since it uses as much as digits as its factorization.

28967309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78139.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 28967309 is about 5382.1286681015. The cubic root of 28967309 is about 307.1161942087.

The spelling of 28967309 in words is "twenty-eight million, nine hundred sixty-seven thousand, three hundred nine".