28909017 has 12 divisors (see below), whose sum is σ = 41821780. Its totient is φ = 19243008.

The previous prime is 28909003. The next prime is 28909021. The reversal of 28909017 is 71090982.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20034576 + 8874441 = 4476^2 + 2979^2 .

It is not a de Polignac number, because 28909017 - 2¹² = 28904921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28909057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4833 + ... + 9009.

Almost surely, 2^28909017 is an apocalyptic number.

It is an amenable number.

28909017 is a deficient number, since it is larger than the sum of its proper divisors (12912763).

28909017 is a wasteful number, since it uses less digits than its factorization.

28909017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952 (or 4949 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 28909017 is about 5376.7106115170. The cubic root of 28909017 is about 306.9100487316.

Adding to 28909017 its reverse (71090982), we get a palindrome (99999999).

The spelling of 28909017 in words is "twenty-eight million, nine hundred nine thousand, seventeen".