28232909 has 8 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 27201600.

The previous prime is 28232881. The next prime is 28232951. The reversal of 28232909 is 90923282.

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 28232909 - 2²⁴ = 11455693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28232959) 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, 5582 + ... + 9360.

It is an arithmetic number, because the mean of its divisors is an integer number (3659040).

Almost surely, 2^28232909 is an apocalyptic number.

It is an amenable number.

28232909 is a deficient number, since it is larger than the sum of its proper divisors (1039411).

28232909 is a wasteful number, since it uses less digits than its factorization.

28232909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

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

The square root of 28232909 is about 5313.4648770835. The cubic root of 28232909 is about 304.4985363609.

The spelling of 28232909 in words is "twenty-eight million, two hundred thirty-two thousand, nine hundred nine".