643570432 has 36 divisors (see below), whose sum is σ = 1352249080. Its totient is φ = 304846848.

The previous prime is 643570427. The next prime is 643570457. The reversal of 643570432 is 234075346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61293 + ... + 71020.

Almost surely, 2^643570432 is an apocalyptic number.

It is an amenable number.

643570432 is an abundant number, since it is smaller than the sum of its proper divisors (708678648).

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

643570432 is a wasteful number, since it uses less digits than its factorization.

643570432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132348 (or 132334 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 34.

The square root of 643570432 is about 25368.6899937699. The cubic root of 643570432 is about 863.3734598040.

It can be divided in two parts, 6435 and 70432, that added together give a palindrome (76867).

The spelling of 643570432 in words is "six hundred forty-three million, five hundred seventy thousand, four hundred thirty-two".