643760353 has 8 divisors (see below), whose sum is σ = 679982336. Its totient is φ = 608504400.

The previous prime is 643760329. The next prime is 643760371. The reversal of 643760353 is 353067346.

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 643760353 - 2⁹ = 643759841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643760303) 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, 240138 + ... + 242803.

It is an arithmetic number, because the mean of its divisors is an integer number (84997792).

Almost surely, 2^643760353 is an apocalyptic number.

It is an amenable number.

643760353 is a deficient number, since it is larger than the sum of its proper divisors (36221983).

643760353 is a wasteful number, since it uses less digits than its factorization.

643760353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483015.

The product of its (nonzero) digits is 136080, while the sum is 37.

The square root of 643760353 is about 25372.4329341906. The cubic root of 643760353 is about 863.4583801254.

The spelling of 643760353 in words is "six hundred forty-three million, seven hundred sixty thousand, three hundred fifty-three".