641234188 has 36 divisors (see below), whose sum is σ = 1312984512. Its totient is φ = 273211680.

The previous prime is 641234171. The next prime is 641234233. The reversal of 641234188 is 881432146.

It is a super-2 number, since 2×641234188² = 822362567720038688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24453 + ... + 43363.

It is an arithmetic number, because the mean of its divisors is an integer number (36471792).

Almost surely, 2^641234188 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 641234188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (656492256).

641234188 is an abundant number, since it is smaller than the sum of its proper divisors (671750324).

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

641234188 is a wasteful number, since it uses less digits than its factorization.

641234188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19102 (or 19093 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 641234188 is about 25322.6023149281. The cubic root of 641234188 is about 862.3274739425.

The spelling of 641234188 in words is "six hundred forty-one million, two hundred thirty-four thousand, one hundred eighty-eight".