258215728 has 20 divisors (see below), whose sum is σ = 500977360. Its totient is φ = 128931264.

The previous prime is 258215723. The next prime is 258215753. The reversal of 258215728 is 827512852.

It is not an unprimeable number, because it can be changed into a prime (258215723) 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 3 ways as a sum of consecutive naturals, for example, 1453 + ... + 22771.

It is an arithmetic number, because the mean of its divisors is an integer number (25048868).

Almost surely, 2^258215728 is an apocalyptic number.

It is an amenable number.

258215728 is a deficient number, since it is larger than the sum of its proper divisors (242761632).

258215728 is a wasteful number, since it uses less digits than its factorization.

258215728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22084 (or 22078 counting only the distinct ones).

The product of its digits is 89600, while the sum is 40.

The square root of 258215728 is about 16069.0923203521. The cubic root of 258215728 is about 636.7870614064.

The spelling of 258215728 in words is "two hundred fifty-eight million, two hundred fifteen thousand, seven hundred twenty-eight".