28216017 has 6 divisors (see below), whose sum is σ = 40756482. Its totient is φ = 18810672.

The previous prime is 28216003. The next prime is 28216031. The reversal of 28216017 is 71061282.

It is an interprime number because it is at equal distance from previous prime (28216003) and next prime (28216031).

It can be written as a sum of positive squares in only one way, i.e., 23126481 + 5089536 = 4809^2 + 2256^2 .

It is not a de Polignac number, because 28216017 - 2⁶ = 28215953 is a prime.

It is a super-2 number, since 2×28216017² = 1592287230688578, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28216037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1567548 + ... + 1567565.

It is an arithmetic number, because the mean of its divisors is an integer number (6792747).

Almost surely, 2^28216017 is an apocalyptic number.

It is an amenable number.

28216017 is a deficient number, since it is larger than the sum of its proper divisors (12540465).

28216017 is a wasteful number, since it uses less digits than its factorization.

28216017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135119 (or 3135116 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28216017 is about 5311.8750926580. The cubic root of 28216017 is about 304.4377961866.

Adding to 28216017 its reverse (71061282), we get a palindrome (99277299).

The spelling of 28216017 in words is "twenty-eight million, two hundred sixteen thousand, seventeen".