28321685 has 16 divisors (see below), whose sum is σ = 40886400. Its totient is φ = 18398016.

The previous prime is 28321679. The next prime is 28321691. The reversal of 28321685 is 58612382.

It is an interprime number because it is at equal distance from previous prime (28321679) and next prime (28321691).

It is not a de Polignac number, because 28321685 - 2¹⁰ = 28320661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20630 + ... + 21959.

It is an arithmetic number, because the mean of its divisors is an integer number (2555400).

Almost surely, 2^28321685 is an apocalyptic number.

It is an amenable number.

28321685 is a deficient number, since it is larger than the sum of its proper divisors (12564715).

28321685 is a wasteful number, since it uses less digits than its factorization.

28321685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42620.

The product of its digits is 23040, while the sum is 35.

The square root of 28321685 is about 5321.8121913499. The cubic root of 28321685 is about 304.8173590748.

The spelling of 28321685 in words is "twenty-eight million, three hundred twenty-one thousand, six hundred eighty-five".