641289538 has 8 divisors (see below), whose sum is σ = 1018518732. Its totient is φ = 301783296.

The previous prime is 641289533. The next prime is 641289541. The reversal of 641289538 is 835982146.

It can be written as a sum of positive squares in 2 ways, for example, as 602064369 + 39225169 = 24537^2 + 6263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×641289538² = 822504543096506888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641289533) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9430695 + ... + 9430762.

Almost surely, 2^641289538 is an apocalyptic number.

641289538 is a deficient number, since it is larger than the sum of its proper divisors (377229194).

641289538 is a wasteful number, since it uses less digits than its factorization.

641289538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18861476.

The product of its digits is 414720, while the sum is 46.

The square root of 641289538 is about 25323.6951884989. The cubic root of 641289538 is about 862.3522846660.

The spelling of 641289538 in words is "six hundred forty-one million, two hundred eighty-nine thousand, five hundred thirty-eight".