641027660 has 96 divisors (see below), whose sum is σ = 1695547392. Its totient is φ = 198132480.

The previous prime is 641027587. The next prime is 641027669. The reversal of 641027660 is 66720146.

It is not an unprimeable number, because it can be changed into a prime (641027669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74165 + ... + 82355.

It is an arithmetic number, because the mean of its divisors is an integer number (17661952).

Almost surely, 2^641027660 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 641027660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847773696).

641027660 is an abundant number, since it is smaller than the sum of its proper divisors (1054519732).

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

641027660 is a wasteful number, since it uses less digits than its factorization.

641027660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263 (or 8261 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 641027660 is about 25318.5240486092. The cubic root of 641027660 is about 862.2348848409.

The spelling of 641027660 in words is "six hundred forty-one million, twenty-seven thousand, six hundred sixty".