641850 has 48 divisors (see below), whose sum is σ = 1740960. Its totient is φ = 155200.

The previous prime is 641843. The next prime is 641863. The reversal of 641850 is 58146.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 641850.

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 23 ways as a sum of consecutive naturals, for example, 1456 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (36270).

2⁶⁴¹⁸⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870480).

641850 is an abundant number, since it is smaller than the sum of its proper divisors (1099110).

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

641850 is a wasteful number, since it uses less digits than its factorization.

641850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 641850 is about 801.1554156342. The cubic root of 641850 is about 86.2603432250.

Adding to 641850 its reverse (58146), we get a palindrome (699996).

The spelling of 641850 in words is "six hundred forty-one thousand, eight hundred fifty".