646043960 has 32 divisors (see below), whose sum is σ = 1454371200. Its totient is φ = 258280320.

The previous prime is 646043927. The next prime is 646043963. The reversal of 646043960 is 69340646.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646043963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108665 + ... + 114455.

It is an arithmetic number, because the mean of its divisors is an integer number (45449100).

Almost surely, 2^646043960 is an apocalyptic number.

It is an amenable number.

646043960 is an abundant number, since it is smaller than the sum of its proper divisors (808327240).

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

646043960 is a wasteful number, since it uses less digits than its factorization.

646043960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8591 (or 8587 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 646043960 is about 25417.3948310994. The cubic root of 646043960 is about 864.4781553976.

The spelling of 646043960 in words is "six hundred forty-six million, forty-three thousand, nine hundred sixty".