258645 has 16 divisors (see below), whose sum is σ = 424512. Its totient is φ = 134400.

The previous prime is 258637. The next prime is 258659. The reversal of 258645 is 546852.

It is not a de Polignac number, because 258645 - 2³ = 258637 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 258645.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445 + ... + 845.

It is an arithmetic number, because the mean of its divisors is an integer number (26532).

2²⁵⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

258645 is a deficient number, since it is larger than the sum of its proper divisors (165867).

258645 is a wasteful number, since it uses less digits than its factorization.

258645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its digits is 9600, while the sum is 30.

The square root of 258645 is about 508.5715288924. The cubic root of 258645 is about 63.7139742628.

It can be divided in two parts, 258 and 645, that added together give a triangular number (903 = T₄₂).

The spelling of 258645 in words is "two hundred fifty-eight thousand, six hundred forty-five".