28726017 has 4 divisors (see below), whose sum is σ = 38301360. Its totient is φ = 19150676.

The previous prime is 28726007. The next prime is 28726067. The reversal of 28726017 is 71062782.

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 a cyclic number.

It is not a de Polignac number, because 28726017 - 2⁴ = 28726001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28726007) 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 3 ways as a sum of consecutive naturals, for example, 4787667 + ... + 4787672.

It is an arithmetic number, because the mean of its divisors is an integer number (9575340).

Almost surely, 2^28726017 is an apocalyptic number.

It is an amenable number.

28726017 is a deficient number, since it is larger than the sum of its proper divisors (9575343).

28726017 is an equidigital number, since it uses as much as digits as its factorization.

28726017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9575342.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 28726017 is about 5359.6657545037. The cubic root of 28726017 is about 306.2610762619.

Adding to 28726017 its reverse (71062782), we get a palindrome (99788799).

The spelling of 28726017 in words is "twenty-eight million, seven hundred twenty-six thousand, seventeen".