28530258 has 32 divisors (see below), whose sum is σ = 61603200. Its totient is φ = 8781696.

The previous prime is 28530253. The next prime is 28530259. The reversal of 28530258 is 85203582.

It is not an unprimeable number, because it can be changed into a prime (28530251) 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 15 ways as a sum of consecutive naturals, for example, 438 + ... + 7566.

It is an arithmetic number, because the mean of its divisors is an integer number (1925100).

Almost surely, 2^28530258 is an apocalyptic number.

28530258 is an abundant number, since it is smaller than the sum of its proper divisors (33072942).

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

28530258 is a wasteful number, since it uses less digits than its factorization.

28530258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7186.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 28530258 is about 5341.3722955810. The cubic root of 28530258 is about 305.5637981590.

The spelling of 28530258 in words is "twenty-eight million, five hundred thirty thousand, two hundred fifty-eight".