641290188 has 96 divisors (see below), whose sum is σ = 1870848000. Its totient is φ = 166098240.

The previous prime is 641290157. The next prime is 641290213. The reversal of 641290188 is 881092146.

It is a super-2 number, since 2×641290188² = 822506210450150688, which contains 22 as substring.

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, 427063 + ... + 428561.

It is an arithmetic number, because the mean of its divisors is an integer number (19488000).

Almost surely, 2^641290188 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 641290188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935424000).

641290188 is an abundant number, since it is smaller than the sum of its proper divisors (1229557812).

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

641290188 is a wasteful number, since it uses less digits than its factorization.

641290188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987 (or 1985 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 641290188 is about 25323.7080223256. The cubic root of 641290188 is about 862.3525760210.

The spelling of 641290188 in words is "six hundred forty-one million, two hundred ninety thousand, one hundred eighty-eight".