28101330 has 40 divisors (see below), whose sum is σ = 75563532. Its totient is φ = 7493472.

The previous prime is 28101301. The next prime is 28101343. The reversal of 28101330 is 3310182.

It can be written as a sum of positive squares in 2 ways, for example, as 28100601 + 729 = 5301^2 + 27^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 16537 + ... + 18156.

Almost surely, 2^28101330 is an apocalyptic number.

28101330 is an abundant number, since it is smaller than the sum of its proper divisors (47462202).

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

28101330 is a wasteful number, since it uses less digits than its factorization.

28101330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34712 (or 34703 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 28101330 is about 5301.0687601653. The cubic root of 28101330 is about 304.0247628143.

The spelling of 28101330 in words is "twenty-eight million, one hundred one thousand, three hundred thirty".