28809933 has 8 divisors (see below), whose sum is σ = 38986848. Its totient is φ = 18919824.

The previous prime is 28809931. The next prime is 28809941. The reversal of 28809933 is 33990882.

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

It is not a de Polignac number, because 28809933 - 2¹ = 28809931 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 (28809931) 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, 71466 + ... + 71867.

It is an arithmetic number, because the mean of its divisors is an integer number (4873356).

Almost surely, 2^28809933 is an apocalyptic number.

It is an amenable number.

28809933 is a deficient number, since it is larger than the sum of its proper divisors (10176915).

28809933 is a wasteful number, since it uses less digits than its factorization.

28809933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143403.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 28809933 is about 5367.4885188513. The cubic root of 28809933 is about 306.5590084976.

The spelling of 28809933 in words is "twenty-eight million, eight hundred nine thousand, nine hundred thirty-three".