643158 has 12 divisors (see below), whose sum is σ = 1393548. Its totient is φ = 214380.

The previous prime is 643129. The next prime is 643183. The reversal of 643158 is 851346.

643158 is a `hidden beast` number, since 643 + 15 + 8 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17848 + ... + 17883.

It is an arithmetic number, because the mean of its divisors is an integer number (116129).

2⁶⁴³¹⁵⁸ is an apocalyptic number.

643158 is an abundant number, since it is smaller than the sum of its proper divisors (750390).

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

643158 is a wasteful number, since it uses less digits than its factorization.

643158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35739 (or 35736 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 643158 is about 801.9713211830. The cubic root of 643158 is about 86.3188989482.

The spelling of 643158 in words is "six hundred forty-three thousand, one hundred fifty-eight".