643258 has 16 divisors (see below), whose sum is σ = 1203264. Its totient is φ = 250560.

The previous prime is 643243. The next prime is 643273. The reversal of 643258 is 852346.

643258 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643243) and next prime (643273).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1935 + ... + 2242.

It is an arithmetic number, because the mean of its divisors is an integer number (75204).

2⁶⁴³²⁵⁸ is an apocalyptic number.

643258 is a deficient number, since it is larger than the sum of its proper divisors (560006).

643258 is a wasteful number, since it uses less digits than its factorization.

643258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197.

The product of its digits is 5760, while the sum is 28.

The square root of 643258 is about 802.0336651288. The cubic root of 643258 is about 86.3233724174.

It can be divided in two parts, 6 and 43258, that added together give a square (43264 = 208²).

The spelling of 643258 in words is "six hundred forty-three thousand, two hundred fifty-eight".