641090 has 8 divisors (see below), whose sum is σ = 1153980. Its totient is φ = 256432.

The previous prime is 641089. The next prime is 641093. The reversal of 641090 is 90146.

It can be written as a sum of positive squares in 2 ways, for example, as 591361 + 49729 = 769^2 + 223^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (641093) 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 3 ways as a sum of consecutive naturals, for example, 32045 + ... + 32064.

2⁶⁴¹⁰⁹⁰ is an apocalyptic number.

641090 is a deficient number, since it is larger than the sum of its proper divisors (512890).

641090 is a wasteful number, since it uses less digits than its factorization.

641090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64116.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 641090 is about 800.6809601833. The cubic root of 641090 is about 86.2262834743.

The spelling of 641090 in words is "six hundred forty-one thousand, ninety".