28934009 has 8 divisors (see below), whose sum is σ = 31235400. Its totient is φ = 26643456.

The previous prime is 28933939. The next prime is 28934011. The reversal of 28934009 is 90043982.

It can be written as a sum of positive squares in 4 ways, for example, as 5382400 + 23551609 = 2320^2 + 4853^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28934009 - 2⁸ = 28933753 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 28934009.

It is not an unprimeable number, because it can be changed into a prime (28934089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3359 + ... + 8315.

It is an arithmetic number, because the mean of its divisors is an integer number (3904425).

Almost surely, 2^28934009 is an apocalyptic number.

It is an amenable number.

28934009 is a deficient number, since it is larger than the sum of its proper divisors (2301391).

28934009 is a wasteful number, since it uses less digits than its factorization.

28934009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28934009 is about 5379.0342069929. The cubic root of 28934009 is about 306.9984650512.

The spelling of 28934009 in words is "twenty-eight million, nine hundred thirty-four thousand, nine".