643830056 has 32 divisors (see below), whose sum is σ = 1245066240. Its totient is φ = 311931648.

The previous prime is 643830037. The next prime is 643830079. The reversal of 643830056 is 650038346.

It is a junction number, because it is equal to n+sod(n) for n = 643829998 and 643830025.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36320 + ... + 51056.

It is an arithmetic number, because the mean of its divisors is an integer number (38908320).

Almost surely, 2^643830056 is an apocalyptic number.

It is an amenable number.

643830056 is a deficient number, since it is larger than the sum of its proper divisors (601236184).

643830056 is a wasteful number, since it uses less digits than its factorization.

643830056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14913 (or 14909 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 643830056 is about 25373.8064940994. The cubic root of 643830056 is about 863.4895425847.

The spelling of 643830056 in words is "six hundred forty-three million, eight hundred thirty thousand, fifty-six".