643023272 has 8 divisors (see below), whose sum is σ = 1205668650. Its totient is φ = 321511632.

The previous prime is 643023257. The next prime is 643023281. The reversal of 643023272 is 272320346.

It can be written as a sum of positive squares in only one way, i.e., 543542596 + 99480676 = 23314^2 + 9974^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 40188947 + ... + 40188962.

Almost surely, 2^643023272 is an apocalyptic number.

It is an amenable number.

643023272 is a deficient number, since it is larger than the sum of its proper divisors (562645378).

643023272 is a wasteful number, since it uses less digits than its factorization.

643023272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80377915 (or 80377911 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 29.

The square root of 643023272 is about 25357.9035411053. The cubic root of 643023272 is about 863.1287119928.

The spelling of 643023272 in words is "six hundred forty-three million, twenty-three thousand, two hundred seventy-two".