28899309 has 16 divisors (see below), whose sum is σ = 39175488. Its totient is φ = 18947712.

The previous prime is 28899289. The next prime is 28899317. The reversal of 28899309 is 90399882.

It is not a de Polignac number, because 28899309 - 2⁷ = 28899181 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28899319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63009 + ... + 63465.

It is an arithmetic number, because the mean of its divisors is an integer number (2448468).

Almost surely, 2^28899309 is an apocalyptic number.

It is an amenable number.

28899309 is a deficient number, since it is larger than the sum of its proper divisors (10276179).

28899309 is a wasteful number, since it uses less digits than its factorization.

28899309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 28899309 is about 5375.8077532590. The cubic root of 28899309 is about 306.8756901745.

The spelling of 28899309 in words is "twenty-eight million, eight hundred ninety-nine thousand, three hundred nine".