643486432 has 12 divisors (see below), whose sum is σ = 1266863976. Its totient is φ = 321743200.

The previous prime is 643486427. The next prime is 643486451. The reversal of 643486432 is 234684346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054444 + ... + 10054507.

It is an arithmetic number, because the mean of its divisors is an integer number (105571998).

Almost surely, 2^643486432 is an apocalyptic number.

It is an amenable number.

643486432 is a deficient number, since it is larger than the sum of its proper divisors (623377544).

643486432 is a wasteful number, since it uses less digits than its factorization.

643486432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20108961 (or 20108953 counting only the distinct ones).

The product of its digits is 331776, while the sum is 40.

The square root of 643486432 is about 25367.0343556357. The cubic root of 643486432 is about 863.3358951374.

The spelling of 643486432 in words is "six hundred forty-three million, four hundred eighty-six thousand, four hundred thirty-two".