641682 has 40 divisors (see below), whose sum is σ = 1528956. Its totient is φ = 200448.

The previous prime is 641681. The next prime is 641701. The reversal of 641682 is 286146.

It can be written as a sum of positive squares in 2 ways, for example, as 641601 + 81 = 801^2 + 9^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

641682 is a Rhonda number in base 12.

It is not an unprimeable number, because it can be changed into a prime (641681) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2638 + ... + 2870.

2⁶⁴¹⁶⁸² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641682, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764478).

641682 is an abundant number, since it is smaller than the sum of its proper divisors (887274).

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

641682 is a wasteful number, since it uses less digits than its factorization.

641682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 255 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 641682 is about 801.0505602020. The cubic root of 641682 is about 86.2528165432.

The spelling of 641682 in words is "six hundred forty-one thousand, six hundred eighty-two".