643683471 has 8 divisors (see below), whose sum is σ = 876505344. Its totient is φ = 419991960.

The previous prime is 643683457. The next prime is 643683503. The reversal of 643683471 is 174386346.

It is a happy number.

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

It is not a de Polignac number, because 643683471 - 2⁹ = 643682959 is a prime.

It is a super-3 number, since 3×643683471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643683071) by changing a digit.

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, 2282425 + ... + 2282706.

It is an arithmetic number, because the mean of its divisors is an integer number (109563168).

Almost surely, 2^643683471 is an apocalyptic number.

643683471 is a deficient number, since it is larger than the sum of its proper divisors (232821873).

643683471 is a wasteful number, since it uses less digits than its factorization.

643683471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4565181.

The product of its digits is 290304, while the sum is 42.

The square root of 643683471 is about 25370.9178194247. The cubic root of 643683471 is about 863.4240055067.

The spelling of 643683471 in words is "six hundred forty-three million, six hundred eighty-three thousand, four hundred seventy-one".