28905217 has 8 divisors (see below), whose sum is σ = 31572000. Its totient is φ = 26244960.

The previous prime is 28905211. The next prime is 28905223. The reversal of 28905217 is 71250982.

It is an interprime number because it is at equal distance from previous prime (28905211) and next prime (28905223).

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 28905217 - 2²³ = 20516609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28905211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15613 + ... + 17365.

It is an arithmetic number, because the mean of its divisors is an integer number (3946500).

Almost surely, 2^28905217 is an apocalyptic number.

It is an amenable number.

28905217 is a deficient number, since it is larger than the sum of its proper divisors (2666783).

28905217 is a wasteful number, since it uses less digits than its factorization.

28905217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28905217 is about 5376.3572239947. The cubic root of 28905217 is about 306.8966006865.

The spelling of 28905217 in words is "twenty-eight million, nine hundred five thousand, two hundred seventeen".