641958 has 8 divisors (see below), whose sum is σ = 1283928. Its totient is φ = 213984.

The previous prime is 641929. The next prime is 641959. The reversal of 641958 is 859146.

It is a sphenic number, since it is the product of 3 distinct primes.

641958 is an admirable number.

It is a super-2 number, since 2×641958² = 824220147528, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 641958.

It is not an unprimeable number, because it can be changed into a prime (641959) by changing a digit.

641958 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 53491 + ... + 53502.

It is an arithmetic number, because the mean of its divisors is an integer number (160491).

2⁶⁴¹⁹⁵⁸ is an apocalyptic number.

641958 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641958 is a wasteful number, since it uses less digits than its factorization.

641958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106998.

The product of its digits is 8640, while the sum is 33.

The square root of 641958 is about 801.2228154515. Note that the first 3 decimals coincide. The cubic root of 641958 is about 86.2651811127.

The spelling of 641958 in words is "six hundred forty-one thousand, nine hundred fifty-eight".