643139048 has 16 divisors (see below), whose sum is σ = 1216558980. Its totient is φ = 318723328.

The previous prime is 643139033. The next prime is 643139059. The reversal of 643139048 is 840931346.

It can be written as a sum of positive squares in 2 ways, for example, as 618119044 + 25020004 = 24862^2 + 5002^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354815 + ... + 356622.

Almost surely, 2^643139048 is an apocalyptic number.

It is an amenable number.

643139048 is a deficient number, since it is larger than the sum of its proper divisors (573419932).

643139048 is a wasteful number, since it uses less digits than its factorization.

643139048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711556 (or 711552 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 643139048 is about 25360.1862769184. The cubic root of 643139048 is about 863.1805108401.

The spelling of 643139048 in words is "six hundred forty-three million, one hundred thirty-nine thousand, forty-eight".