641900 has 54 divisors (see below), whose sum is σ = 1632708. Its totient is φ = 218400.

The previous prime is 641897. The next prime is 641909. The reversal of 641900 is 9146.

It is a super-2 number, since 2×641900² = 824071220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (641909) 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 17 ways as a sum of consecutive naturals, for example, 4835 + ... + 4965.

2⁶⁴¹⁹⁰⁰ 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 641900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816354).

641900 is an abundant number, since it is smaller than the sum of its proper divisors (990808).

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

641900 is a wasteful number, since it uses less digits than its factorization.

641900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 145 counting only the distinct ones).

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

The square root of 641900 is about 801.1866199582. The cubic root of 641900 is about 86.2625830553.

The spelling of 641900 in words is "six hundred forty-one thousand, nine hundred".