28016517 has 4 divisors (see below), whose sum is σ = 37355360. Its totient is φ = 18677676.

The previous prime is 28016477. The next prime is 28016531. The reversal of 28016517 is 71561082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28016517 - 2¹² = 28012421 is a prime.

It is a super-2 number, since 2×28016517² = 1569850449622578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28016537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4669417 + ... + 4669422.

It is an arithmetic number, because the mean of its divisors is an integer number (9338840).

Almost surely, 2^28016517 is an apocalyptic number.

It is an amenable number.

28016517 is a deficient number, since it is larger than the sum of its proper divisors (9338843).

28016517 is an equidigital number, since it uses as much as digits as its factorization.

28016517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338842.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 28016517 is about 5293.0631018343. The cubic root of 28016517 is about 303.7185941890.

Adding to 28016517 its reverse (71561082), we get a palindrome (99577599).

The spelling of 28016517 in words is "twenty-eight million, sixteen thousand, five hundred seventeen".