28475617 has 4 divisors (see below), whose sum is σ = 28624896. Its totient is φ = 28326340.

The previous prime is 28475591. The next prime is 28475669. The reversal of 28475617 is 71657482.

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-28475617 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28475617.

It is not an unprimeable number, because it can be changed into a prime (28475687) 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, 74353 + ... + 74734.

It is an arithmetic number, because the mean of its divisors is an integer number (7156224).

Almost surely, 2^28475617 is an apocalyptic number.

It is an amenable number.

28475617 is a deficient number, since it is larger than the sum of its proper divisors (149279).

28475617 is a wasteful number, since it uses less digits than its factorization.

28475617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149278.

The product of its digits is 94080, while the sum is 40.

The square root of 28475617 is about 5336.2549601757. The cubic root of 28475617 is about 305.3686021003.

It can be divided in two parts, 28475 and 617, that added together give a palindrome (29092).

The spelling of 28475617 in words is "twenty-eight million, four hundred seventy-five thousand, six hundred seventeen".