643082938 has 4 divisors (see below), whose sum is σ = 964624410. Its totient is φ = 321541468.

The previous prime is 643082933. The next prime is 643082963. The reversal of 643082938 is 839280346.

643082938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 620358649 + 22724289 = 24907^2 + 4767^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643082894 and 643082903.

It is not an unprimeable number, because it can be changed into a prime (643082933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160770733 + ... + 160770736.

Almost surely, 2^643082938 is an apocalyptic number.

643082938 is a deficient number, since it is larger than the sum of its proper divisors (321541472).

643082938 is a wasteful number, since it uses less digits than its factorization.

643082938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321541471.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 643082938 is about 25359.0799911984. The cubic root of 643082938 is about 863.1554076803.

The spelling of 643082938 in words is "six hundred forty-three million, eighty-two thousand, nine hundred thirty-eight".