28070017 has 4 divisors (see below), whose sum is σ = 28545840. Its totient is φ = 27594196.

The previous prime is 28069997. The next prime is 28070047. The reversal of 28070017 is 71007082.

It is a happy number.

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 28070017 - 2⁷ = 28069889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28069973 and 28070000.

It is not an unprimeable number, because it can be changed into a prime (28070047) 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, 237823 + ... + 237940.

It is an arithmetic number, because the mean of its divisors is an integer number (7136460).

Almost surely, 2^28070017 is an apocalyptic number.

It is an amenable number.

28070017 is a deficient number, since it is larger than the sum of its proper divisors (475823).

28070017 is an equidigital number, since it uses as much as digits as its factorization.

28070017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475822.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 28070017 is about 5298.1144759244. The cubic root of 28070017 is about 303.9117970393.

Adding to 28070017 its reverse (71007082), we get a palindrome (99077099).

The spelling of 28070017 in words is "twenty-eight million, seventy thousand, seventeen".