641630 has 32 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 220320.

The previous prime is 641623. The next prime is 641633. The reversal of 641630 is 36146.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641633) by changing a digit.

641630 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1937 + ... + 2243.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2⁶⁴¹⁶³⁰ is an apocalyptic number.

641630 is an abundant number, since it is smaller than the sum of its proper divisors (688930).

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

641630 is a wasteful number, since it uses less digits than its factorization.

641630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 641630 is about 801.0181021675. The cubic root of 641630 is about 86.2504865897.

Adding to 641630 its reverse (36146), we get a palindrome (677776).

It can be divided in two parts, 6416 and 30, that added together give a palindrome (6446).

The spelling of 641630 in words is "six hundred forty-one thousand, six hundred thirty".