28133320 has 32 divisors (see below), whose sum is σ = 65014200. Its totient is φ = 10948608.

The previous prime is 28133299. The next prime is 28133327. The reversal of 28133320 is 2333182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28068804 + 64516 = 5298^2 + 254^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28133291 and 28133300.

It is not an unprimeable number, because it can be changed into a prime (28133327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8025 + ... + 10984.

Almost surely, 2^28133320 is an apocalyptic number.

28133320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28133320 is an abundant number, since it is smaller than the sum of its proper divisors (36880880).

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

28133320 is a wasteful number, since it uses less digits than its factorization.

28133320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19057 (or 19053 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 28133320 is about 5304.0852180183. The cubic root of 28133320 is about 304.1400843307.

The spelling of 28133320 in words is "twenty-eight million, one hundred thirty-three thousand, three hundred twenty".