641504635 has 8 divisors (see below), whose sum is σ = 769981536. Its totient is φ = 513086400.

The previous prime is 641504597. The next prime is 641504713. The reversal of 641504635 is 536405146.

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

It is not a de Polignac number, because 641504635 - 2²⁷ = 507286907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641504635.

It is an unprimeable number.

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, 14767 + ... + 38743.

It is an arithmetic number, because the mean of its divisors is an integer number (96247692).

Almost surely, 2^641504635 is an apocalyptic number.

641504635 is a deficient number, since it is larger than the sum of its proper divisors (128476901).

641504635 is a wasteful number, since it uses less digits than its factorization.

641504635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29333.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 641504635 is about 25327.9417837297. The cubic root of 641504635 is about 862.4486886789.

The spelling of 641504635 in words is "six hundred forty-one million, five hundred four thousand, six hundred thirty-five".