28033317 has 16 divisors (see below), whose sum is σ = 44726080. Its totient is φ = 17251056.

The previous prime is 28033283. The next prime is 28033337. The reversal of 28033317 is 71333082.

It is a de Polignac number, because none of the positive numbers 2^k-28033317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28033337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39583 + ... + 40284.

It is an arithmetic number, because the mean of its divisors is an integer number (2795380).

Almost surely, 2^28033317 is an apocalyptic number.

28033317 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28033317 is a deficient number, since it is larger than the sum of its proper divisors (16692763).

28033317 is a wasteful number, since it uses less digits than its factorization.

28033317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79889 (or 79883 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 28033317 is about 5294.6498467793. The cubic root of 28033317 is about 303.7792899663.

Adding to 28033317 its reverse (71333082), we get a palindrome (99366399).

The spelling of 28033317 in words is "twenty-eight million, thirty-three thousand, three hundred seventeen".