646843650 has 24 divisors (see below), whose sum is σ = 1604172624. Its totient is φ = 172491600.

The previous prime is 646843643. The next prime is 646843669. The reversal of 646843650 is 56348646.

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 11 ways as a sum of consecutive naturals, for example, 2155996 + ... + 2156295.

It is an arithmetic number, because the mean of its divisors is an integer number (66840526).

Almost surely, 2^646843650 is an apocalyptic number.

646843650 is an abundant number, since it is smaller than the sum of its proper divisors (957328974).

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

646843650 is a wasteful number, since it uses less digits than its factorization.

646843650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4312306 (or 4312301 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 646843650 is about 25433.1211218757. The cubic root of 646843650 is about 864.8346994991.

The spelling of 646843650 in words is "six hundred forty-six million, eight hundred forty-three thousand, six hundred fifty".