28005258 has 16 divisors (see below), whose sum is σ = 56589120. Its totient is φ = 9238656.

The previous prime is 28005247. The next prime is 28005269. The reversal of 28005258 is 85250082.

It is an interprime number because it is at equal distance from previous prime (28005247) and next prime (28005269).

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, 23478 + ... + 24641.

It is an arithmetic number, because the mean of its divisors is an integer number (3536820).

Almost surely, 2^28005258 is an apocalyptic number.

28005258 is an abundant number, since it is smaller than the sum of its proper divisors (28583862).

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

28005258 is a wasteful number, since it uses less digits than its factorization.

28005258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48221.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28005258 is about 5291.9994331065. Note that the first 3 decimals coincide. The cubic root of 28005258 is about 303.6779035989.

The spelling of 28005258 in words is "twenty-eight million, five thousand, two hundred fifty-eight".