28290330 has 32 divisors (see below), whose sum is σ = 75441600. Its totient is φ = 7544016.

The previous prime is 28290319. The next prime is 28290331. The reversal of 28290330 is 3309282.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28290294 and 28290303.

It is not an unprimeable number, because it can be changed into a prime (28290331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52120 + ... + 52659.

It is an arithmetic number, because the mean of its divisors is an integer number (2357550).

Almost surely, 2^28290330 is an apocalyptic number.

28290330 is an abundant number, since it is smaller than the sum of its proper divisors (47151270).

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

28290330 is a wasteful number, since it uses less digits than its factorization.

28290330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104795 (or 104789 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 28290330 is about 5318.8654805325. The cubic root of 28290330 is about 304.7048295469.

The spelling of 28290330 in words is "twenty-eight million, two hundred ninety thousand, three hundred thirty".