641488634 has 8 divisors (see below), whose sum is σ = 964456500. Its totient is φ = 320003136.

The previous prime is 641488597. The next prime is 641488637. The reversal of 641488634 is 436884146.

It can be written as a sum of positive squares in 2 ways, for example, as 501894409 + 139594225 = 22403^2 + 11815^2 .

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

It is not an unprimeable number, because it can be changed into a prime (641488637) 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 3 ways as a sum of consecutive naturals, for example, 369509 + ... + 371240.

Almost surely, 2^641488634 is an apocalyptic number.

641488634 is a deficient number, since it is larger than the sum of its proper divisors (322967866).

641488634 is a wasteful number, since it uses less digits than its factorization.

641488634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741184.

The product of its digits is 442368, while the sum is 44.

The square root of 641488634 is about 25327.6259053232. The cubic root of 641488634 is about 862.4415179559.

The spelling of 641488634 in words is "six hundred forty-one million, four hundred eighty-eight thousand, six hundred thirty-four".