643033064 has 64 divisors (see below), whose sum is σ = 1267684560. Its totient is φ = 305510400.

The previous prime is 643033049. The next prime is 643033073. The reversal of 643033064 is 460330346.

It can be written as a sum of positive squares in 8 ways, for example, as 576480100 + 66552964 = 24010^2 + 8158^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4095674 + ... + 4095830.

Almost surely, 2^643033064 is an apocalyptic number.

It is an amenable number.

643033064 is a deficient number, since it is larger than the sum of its proper divisors (624651496).

643033064 is a wasteful number, since it uses less digits than its factorization.

643033064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 29.

The square root of 643033064 is about 25358.0966162683. The cubic root of 643033064 is about 863.1330932305.

The spelling of 643033064 in words is "six hundred forty-three million, thirty-three thousand, sixty-four".