28304890 has 8 divisors (see below), whose sum is σ = 50948820. Its totient is φ = 11321952.

The previous prime is 28304869. The next prime is 28304897. The reversal of 28304890 is 9840382.

It can be written as a sum of positive squares in 2 ways, for example, as 26347689 + 1957201 = 5133^2 + 1399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28304897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1415235 + ... + 1415254.

Almost surely, 2^28304890 is an apocalyptic number.

28304890 is a deficient number, since it is larger than the sum of its proper divisors (22643930).

28304890 is a wasteful number, since it uses less digits than its factorization.

28304890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830496.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28304890 is about 5320.2340174094. The cubic root of 28304890 is about 304.7570940655.

The spelling of 28304890 in words is "twenty-eight million, three hundred four thousand, eight hundred ninety".