641858 has 24 divisors (see below), whose sum is σ = 1170432. Its totient is φ = 258552.

The previous prime is 641843. The next prime is 641863. The reversal of 641858 is 858146.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4991 + ... + 5117.

It is an arithmetic number, because the mean of its divisors is an integer number (48768).

2⁶⁴¹⁸⁵⁸ is an apocalyptic number.

641858 is a deficient number, since it is larger than the sum of its proper divisors (528574).

641858 is a wasteful number, since it uses less digits than its factorization.

641858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 155 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 641858 is about 801.1604084077. The cubic root of 641858 is about 86.2607016057.

The spelling of 641858 in words is "six hundred forty-one thousand, eight hundred fifty-eight".