28900109 has 8 divisors (see below), whose sum is σ = 33129408. Its totient is φ = 24696000.

The previous prime is 28900061. The next prime is 28900111. The reversal of 28900109 is 90100982.

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

It is not a de Polignac number, because 28900109 - 2²⁰ = 27851533 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 (28900129) 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, 3767 + ... + 8484.

It is an arithmetic number, because the mean of its divisors is an integer number (4141176).

Almost surely, 2^28900109 is an apocalyptic number.

It is an amenable number.

28900109 is a deficient number, since it is larger than the sum of its proper divisors (4229299).

28900109 is a wasteful number, since it uses less digits than its factorization.

28900109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12595.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 28900109 is about 5375.8821601668. The cubic root of 28900109 is about 306.8785218257.

The spelling of 28900109 in words is "twenty-eight million, nine hundred thousand, one hundred nine".