643012 has 6 divisors (see below), whose sum is σ = 1125278. Its totient is φ = 321504.

The previous prime is 643009. The next prime is 643021. The reversal of 643012 is 210346.

It can be written as a sum of positive squares in only one way, i.e., 427716 + 215296 = 654^2 + 464^2 .

It is a super-3 number, since 3×643012³ = 797587774325333184, which contains 333 as substring.

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 as a sum of consecutive naturals, namely, 80373 + ... + 80380.

2⁶⁴³⁰¹² is an apocalyptic number.

It is an amenable number.

643012 is a deficient number, since it is larger than the sum of its proper divisors (482266).

643012 is a wasteful number, since it uses less digits than its factorization.

643012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160757 (or 160755 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 643012 is about 801.8802903177. The cubic root of 643012 is about 86.3123668503.

Adding to 643012 its reverse (210346), we get a palindrome (853358).

The spelling of 643012 in words is "six hundred forty-three thousand, twelve".