641821722 has 16 divisors (see below), whose sum is σ = 1284330720. Its totient is φ = 213826032.

The previous prime is 641821639. The next prime is 641821727. The reversal of 641821722 is 227128146.

It is not an unprimeable number, because it can be changed into a prime (641821727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16072 + ... + 39267.

It is an arithmetic number, because the mean of its divisors is an integer number (80270670).

Almost surely, 2^641821722 is an apocalyptic number.

641821722 is an abundant number, since it is smaller than the sum of its proper divisors (642508998).

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

641821722 is a wasteful number, since it uses less digits than its factorization.

641821722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57277.

The product of its digits is 10752, while the sum is 33.

The square root of 641821722 is about 25334.2006386624. The cubic root of 641821722 is about 862.5907641512.

Adding to 641821722 its reverse (227128146), we get a palindrome (868949868).

The spelling of 641821722 in words is "six hundred forty-one million, eight hundred twenty-one thousand, seven hundred twenty-two".