641364639 has 8 divisors (see below), whose sum is σ = 855497520. Its totient is φ = 427404096.

The previous prime is 641364617. The next prime is 641364649. The reversal of 641364639 is 936463146.

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

It is not a de Polignac number, because 641364639 - 2⁹ = 641364127 is a prime.

It is a super-3 number, since 3×641364639³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 641364639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641364649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34134 + ... + 49475.

It is an arithmetic number, because the mean of its divisors is an integer number (106937190).

Almost surely, 2^641364639 is an apocalyptic number.

641364639 is a deficient number, since it is larger than the sum of its proper divisors (214132881).

641364639 is a wasteful number, since it uses less digits than its factorization.

641364639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86169.

The product of its digits is 279936, while the sum is 42.

The square root of 641364639 is about 25325.1779658110. The cubic root of 641364639 is about 862.3859465234.

The spelling of 641364639 in words is "six hundred forty-one million, three hundred sixty-four thousand, six hundred thirty-nine".