28670017 has 4 divisors (see below), whose sum is σ = 28688176. Its totient is φ = 28651860.

The previous prime is 28670003. The next prime is 28670023. The reversal of 28670017 is 71007682.

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 a de Polignac number, because none of the positive numbers 2^k-28670017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28670077) 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, 6459 + ... + 9952.

It is an arithmetic number, because the mean of its divisors is an integer number (7172044).

Almost surely, 2^28670017 is an apocalyptic number.

It is an amenable number.

28670017 is a deficient number, since it is larger than the sum of its proper divisors (18159).

28670017 is a wasteful number, since it uses less digits than its factorization.

28670017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18158.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 28670017 is about 5354.4389995592. The cubic root of 28670017 is about 306.0619330122.

Adding to 28670017 its reverse (71007682), we get a palindrome (99677699).

The spelling of 28670017 in words is "twenty-eight million, six hundred seventy thousand, seventeen".