641944799 has 8 divisors (see below), whose sum is σ = 645336720. Its totient is φ = 638560000.

The previous prime is 641944759. The next prime is 641944817. The reversal of 641944799 is 997449146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641944799 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 641944799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641944759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307439 + ... + 309519.

It is an arithmetic number, because the mean of its divisors is an integer number (80667090).

Almost surely, 2^641944799 is an apocalyptic number.

641944799 is a deficient number, since it is larger than the sum of its proper divisors (3391921).

641944799 is a wasteful number, since it uses less digits than its factorization.

641944799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561.

The product of its digits is 1959552, while the sum is 53.

The square root of 641944799 is about 25336.6295903776. The cubic root of 641944799 is about 862.6458979962.

The spelling of 641944799 in words is "six hundred forty-one million, nine hundred forty-four thousand, seven hundred ninety-nine".