643475724 has 12 divisors (see below), whose sum is σ = 1501443384. Its totient is φ = 214491904.

The previous prime is 643475699. The next prime is 643475797. The reversal of 643475724 is 427574346.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×643475724² = 828122014754648352, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26811477 + ... + 26811500.

It is an arithmetic number, because the mean of its divisors is an integer number (125120282).

Almost surely, 2^643475724 is an apocalyptic number.

It is an amenable number.

643475724 is an abundant number, since it is smaller than the sum of its proper divisors (857967660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643475724 is a wasteful number, since it uses less digits than its factorization.

643475724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53622984 (or 53622982 counting only the distinct ones).

The product of its digits is 564480, while the sum is 42.

The square root of 643475724 is about 25366.8232934280. The cubic root of 643475724 is about 863.3311063019.

The spelling of 643475724 in words is "six hundred forty-three million, four hundred seventy-five thousand, seven hundred twenty-four".