641284 has 24 divisors (see below), whose sum is σ = 1319360. Its totient is φ = 266976.

The previous prime is 641279. The next prime is 641287. The reversal of 641284 is 482146.

It is a super-2 number, since 2×641284² = 822490337312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727 + ... + 1345.

2⁶⁴¹²⁸⁴ 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 641284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659680).

641284 is an abundant number, since it is smaller than the sum of its proper divisors (678076).

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

641284 is a wasteful number, since it uses less digits than its factorization.

641284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 665 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 641284 is about 800.8020978993. The cubic root of 641284 is about 86.2349802313.

The spelling of 641284 in words is "six hundred forty-one thousand, two hundred eighty-four".