28085330 has 48 divisors (see below), whose sum is σ = 63345240. Its totient is φ = 8886528.

The previous prime is 28085303. The next prime is 28085333. The reversal of 28085330 is 3358082.

It can be written as a sum of positive squares in 4 ways, for example, as 10504081 + 17581249 = 3241^2 + 4193^2 .

It is a super-2 number, since 2×28085330² = 1577571522417800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28085293 and 28085302.

It is not an unprimeable number, because it can be changed into a prime (28085333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4166 + ... + 8574.

Almost surely, 2^28085330 is an apocalyptic number.

28085330 is an abundant number, since it is smaller than the sum of its proper divisors (35259910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28085330 is a wasteful number, since it uses less digits than its factorization.

28085330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443 (or 4436 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 28085330 is about 5299.5594156496. The cubic root of 28085330 is about 303.9670511958.

The spelling of 28085330 in words is "twenty-eight million, eighty-five thousand, three hundred thirty".