28417897 has 4 divisors (see below), whose sum is σ = 30089556. Its totient is φ = 26746240.

The previous prime is 28417891. The next prime is 28417913. The reversal of 28417897 is 79871482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16556761 + 11861136 = 4069^2 + 3444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28417897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28417891) 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, 835804 + ... + 835837.

It is an arithmetic number, because the mean of its divisors is an integer number (7522389).

Almost surely, 2^28417897 is an apocalyptic number.

It is an amenable number.

28417897 is a deficient number, since it is larger than the sum of its proper divisors (1671659).

28417897 is a wasteful number, since it uses less digits than its factorization.

28417897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671658.

The product of its digits is 225792, while the sum is 46.

The square root of 28417897 is about 5330.8439294356. The cubic root of 28417897 is about 305.1621354199.

It can be divided in two parts, 284 and 17897, that added together give a palindrome (18181).

The spelling of 28417897 in words is "twenty-eight million, four hundred seventeen thousand, eight hundred ninety-seven".