641784 has 96 divisors (see below), whose sum is σ = 2010960. Its totient is φ = 168960.

The previous prime is 641761. The next prime is 641789. The reversal of 641784 is 487146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641789) by changing a digit.

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, 37744 + ... + 37760.

2⁶⁴¹⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1005480).

641784 is an abundant number, since it is smaller than the sum of its proper divisors (1369176).

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

641784 is a wasteful number, since it uses less digits than its factorization.

641784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61 (or 46 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 641784 is about 801.1142240655. The cubic root of 641784 is about 86.2573864710.

The spelling of 641784 in words is "six hundred forty-one thousand, seven hundred eighty-four".