641020 has 12 divisors (see below), whose sum is σ = 1346184. Its totient is φ = 256400.

The previous prime is 640993. The next prime is 641051. The reversal of 641020 is 20146.

It is a congruent number.

It is an unprimeable number.

641020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16006 + ... + 16045.

It is an arithmetic number, because the mean of its divisors is an integer number (112182).

2⁶⁴¹⁰²⁰ is an apocalyptic number.

It is an amenable number.

641020 is an abundant number, since it is smaller than the sum of its proper divisors (705164).

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

641020 is a wasteful number, since it uses less digits than its factorization.

641020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32060 (or 32058 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 641020 is about 800.6372461983. The cubic root of 641020 is about 86.2231450384.

Adding to 641020 its reverse (20146), we get a palindrome (661166).

The spelling of 641020 in words is "six hundred forty-one thousand, twenty".