643073701 has 8 divisors (see below), whose sum is σ = 645805944. Its totient is φ = 640347840.

The previous prime is 643073699. The next prime is 643073707. The reversal of 643073701 is 107370346.

It can be written as a sum of positive squares in 4 ways, for example, as 27984100 + 615089601 = 5290^2 + 24801^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 643073701 - 2¹ = 643073699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643073707) 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 7 ways as a sum of consecutive naturals, for example, 324951 + ... + 326923.

It is an arithmetic number, because the mean of its divisors is an integer number (80725743).

Almost surely, 2^643073701 is an apocalyptic number.

It is an amenable number.

643073701 is a deficient number, since it is larger than the sum of its proper divisors (2732243).

643073701 is a wasteful number, since it uses less digits than its factorization.

643073701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191.

The product of its (nonzero) digits is 10584, while the sum is 31.

The square root of 643073701 is about 25358.8978664294. The cubic root of 643073701 is about 863.1512749813.

The spelling of 643073701 in words is "six hundred forty-three million, seventy-three thousand, seven hundred one".