643743069 has 8 divisors (see below), whose sum is σ = 858449760. Its totient is φ = 429099216.

The previous prime is 643743019. The next prime is 643743077. The reversal of 643743069 is 960347346.

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

It is not a de Polignac number, because 643743069 - 2⁷ = 643742941 is a prime.

It is a super-2 number, since 2×643743069² = 828810277771077522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643743069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643743019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19422 + ... + 40800.

It is an arithmetic number, because the mean of its divisors is an integer number (107306220).

Almost surely, 2^643743069 is an apocalyptic number.

It is an amenable number.

643743069 is a deficient number, since it is larger than the sum of its proper divisors (214706691).

643743069 is a wasteful number, since it uses less digits than its factorization.

643743069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31419.

The product of its (nonzero) digits is 326592, while the sum is 42.

The square root of 643743069 is about 25372.0923260184. The cubic root of 643743069 is about 863.4506525354.

The spelling of 643743069 in words is "six hundred forty-three million, seven hundred forty-three thousand, sixty-nine".