28285645 has 4 divisors (see below), whose sum is σ = 33942780. Its totient is φ = 22628512.

The previous prime is 28285601. The next prime is 28285657. The reversal of 28285645 is 54658282.

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 3175524 + 25110121 = 1782^2 + 5011^2 .

It is a cyclic number.

It is not a de Polignac number, because 28285645 - 2¹⁵ = 28252877 is a prime.

It is a super-3 number, since 3×28285645³ (a number of 23 digits) contains 333 as substring.

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 junction number, because it is equal to n+sod(n) for n = 28285598 and 28285607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2828560 + ... + 2828569.

It is an arithmetic number, because the mean of its divisors is an integer number (8485695).

Almost surely, 2^28285645 is an apocalyptic number.

It is an amenable number.

28285645 is a deficient number, since it is larger than the sum of its proper divisors (5657135).

28285645 is an equidigital number, since it uses as much as digits as its factorization.

28285645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657134.

The product of its digits is 153600, while the sum is 40.

The square root of 28285645 is about 5318.4250488279. The cubic root of 28285645 is about 304.6880084760.

The spelling of 28285645 in words is "twenty-eight million, two hundred eighty-five thousand, six hundred forty-five".