643307572 has 6 divisors (see below), whose sum is σ = 1125788258. Its totient is φ = 321653784.

The previous prime is 643307569. The next prime is 643307573. The reversal of 643307572 is 275703346.

It can be written as a sum of positive squares in only one way, i.e., 416323216 + 226984356 = 20404^2 + 15066^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643307573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80413443 + ... + 80413450.

Almost surely, 2^643307572 is an apocalyptic number.

It is an amenable number.

643307572 is a deficient number, since it is larger than the sum of its proper divisors (482480686).

643307572 is a wasteful number, since it uses less digits than its factorization.

643307572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160826897 (or 160826895 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 37.

The square root of 643307572 is about 25363.5086689519. The cubic root of 643307572 is about 863.2558983368.

The spelling of 643307572 in words is "six hundred forty-three million, three hundred seven thousand, five hundred seventy-two".