641589168 has 160 divisors (see below), whose sum is σ = 1868666112. Its totient is φ = 188032000.

The previous prime is 641589133. The next prime is 641589181. The reversal of 641589168 is 861985146.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2826271 + ... + 2826497.

Almost surely, 2^641589168 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 641589168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934333056).

641589168 is an abundant number, since it is smaller than the sum of its proper divisors (1227076944).

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

641589168 is a wasteful number, since it uses less digits than its factorization.

641589168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 397 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 641589168 is about 25329.6104983871. The cubic root of 641589168 is about 862.4865695031.

The spelling of 641589168 in words is "six hundred forty-one million, five hundred eighty-nine thousand, one hundred sixty-eight".