643004680 has 16 divisors (see below), whose sum is σ = 1446760620. Its totient is φ = 257201856.

The previous prime is 643004657. The next prime is 643004689. The reversal of 643004680 is 86400346.

It can be written as a sum of positive squares in 2 ways, for example, as 620707396 + 22297284 = 24914^2 + 4722^2 .

It is not an unprimeable number, because it can be changed into a prime (643004689) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 8037519 + ... + 8037598.

Almost surely, 2^643004680 is an apocalyptic number.

It is an amenable number.

643004680 is an abundant number, since it is smaller than the sum of its proper divisors (803755940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643004680 is a wasteful number, since it uses less digits than its factorization.

643004680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16075128 (or 16075124 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 643004680 is about 25357.5369466358. The cubic root of 643004680 is about 863.1203932458.

The spelling of 643004680 in words is "six hundred forty-three million, four thousand, six hundred eighty".