258205869 has 12 divisors (see below), whose sum is σ = 383044636. Its totient is φ = 167484672.

The previous prime is 258205867. The next prime is 258205897. The reversal of 258205869 is 968502852.

258205869 is a `hidden beast` number, since 2 + 582 + 0 + 5 + 8 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 169130025 + 89075844 = 13005^2 + 9438^2 .

It is not a de Polignac number, because 258205869 - 2¹ = 258205867 is a prime.

It is a super-2 number, since 2×258205869² = 133340541572090322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258205867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387364 + ... + 388029.

Almost surely, 2^258205869 is an apocalyptic number.

It is an amenable number.

258205869 is a deficient number, since it is larger than the sum of its proper divisors (124838767).

258205869 is a wasteful number, since it uses less digits than its factorization.

258205869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775436 (or 775433 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 258205869 is about 16068.7855483854. The cubic root of 258205869 is about 636.7789568607.

The spelling of 258205869 in words is "two hundred fifty-eight million, two hundred five thousand, eight hundred sixty-nine".