641569068 has 72 divisors (see below), whose sum is σ = 1884879360. Its totient is φ = 180194400.

The previous prime is 641569063. The next prime is 641569079. The reversal of 641569068 is 860965146.

It is a super-2 number, since 2×641569068² = 823221738028777248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (641569063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6708 + ... + 36443.

It is an arithmetic number, because the mean of its divisors is an integer number (26178880).

Almost surely, 2^641569068 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 641569068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942439680).

641569068 is an abundant number, since it is smaller than the sum of its proper divisors (1243310292).

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

641569068 is a wasteful number, since it uses less digits than its factorization.

641569068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43227 (or 43222 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 641569068 is about 25329.2137264464. The cubic root of 641569068 is about 862.4775626173.

The spelling of 641569068 in words is "six hundred forty-one million, five hundred sixty-nine thousand, sixty-eight".