643085432 has 32 divisors (see below), whose sum is σ = 1316632320. Its totient is φ = 292038240.

The previous prime is 643085423. The next prime is 643085441. The reversal of 643085432 is 234580346.

It is an interprime number because it is at equal distance from previous prime (643085423) and next prime (643085441).

It is a junction number, because it is equal to n+sod(n) for n = 643085392 and 643085401.

It is a congruent number.

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, 114023 + ... + 119529.

It is an arithmetic number, because the mean of its divisors is an integer number (41144760).

Almost surely, 2^643085432 is an apocalyptic number.

It is an amenable number.

643085432 is an abundant number, since it is smaller than the sum of its proper divisors (673546888).

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

643085432 is a wasteful number, since it uses less digits than its factorization.

643085432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851 (or 6847 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 643085432 is about 25359.1291648590. The cubic root of 643085432 is about 863.1565235067.

The spelling of 643085432 in words is "six hundred forty-three million, eighty-five thousand, four hundred thirty-two".