643321032 has 64 divisors (see below), whose sum is σ = 1624795200. Its totient is φ = 212256000.

The previous prime is 643321027. The next prime is 643321093. The reversal of 643321032 is 230123346.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 643320993 and 643321011.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1620258 + ... + 1620654.

It is an arithmetic number, because the mean of its divisors is an integer number (25387425).

Almost surely, 2^643321032 is an apocalyptic number.

It is an amenable number.

643321032 is an abundant number, since it is smaller than the sum of its proper divisors (981474168).

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

643321032 is a wasteful number, since it uses less digits than its factorization.

643321032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 643321032 is about 25363.7740094017. The cubic root of 643321032 is about 863.2619189631.

Adding to 643321032 its reverse (230123346), we get a palindrome (873444378).

The spelling of 643321032 in words is "six hundred forty-three million, three hundred twenty-one thousand, thirty-two".