28730258 has 16 divisors (see below), whose sum is σ = 44596440. Its totient is φ = 13872000.

The previous prime is 28730237. The next prime is 28730263. The reversal of 28730258 is 85203782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17081689 + 11648569 = 4133^2 + 3413^2 .

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 7 ways as a sum of consecutive naturals, for example, 6548 + ... + 10016.

Almost surely, 2^28730258 is an apocalyptic number.

28730258 is a deficient number, since it is larger than the sum of its proper divisors (15866182).

28730258 is a wasteful number, since it uses less digits than its factorization.

28730258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28730258 is about 5360.0613802456. The cubic root of 28730258 is about 306.2761472608.

The spelling of 28730258 in words is "twenty-eight million, seven hundred thirty thousand, two hundred fifty-eight".