28417685 has 4 divisors (see below), whose sum is σ = 34101228. Its totient is φ = 22734144.

The previous prime is 28417681. The next prime is 28417687. The reversal of 28417685 is 58671482.

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 22648081 + 5769604 = 4759^2 + 2402^2 .

It is a cyclic number.

It is not a de Polignac number, because 28417685 - 2² = 28417681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28417681) 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, 2841764 + ... + 2841773.

It is an arithmetic number, because the mean of its divisors is an integer number (8525307).

Almost surely, 2^28417685 is an apocalyptic number.

It is an amenable number.

28417685 is a deficient number, since it is larger than the sum of its proper divisors (5683543).

28417685 is an equidigital number, since it uses as much as digits as its factorization.

28417685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683542.

The product of its digits is 107520, while the sum is 41.

The square root of 28417685 is about 5330.8240451172. The cubic root of 28417685 is about 305.1613765726.

The spelling of 28417685 in words is "twenty-eight million, four hundred seventeen thousand, six hundred eighty-five".