646126850 has 12 divisors (see below), whose sum is σ = 1201796034. Its totient is φ = 258450720.

The previous prime is 646126849. The next prime is 646126853. The reversal of 646126850 is 58621646.

It can be written as a sum of positive squares in 3 ways, for example, as 620956561 + 25170289 = 24919^2 + 5017^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646126853) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6461219 + ... + 6461318.

Almost surely, 2^646126850 is an apocalyptic number.

646126850 is a deficient number, since it is larger than the sum of its proper divisors (555669184).

646126850 is a wasteful number, since it uses less digits than its factorization.

646126850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12922549 (or 12922544 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 646126850 is about 25419.0253550367. The cubic root of 646126850 is about 864.5151258074.

The spelling of 646126850 in words is "six hundred forty-six million, one hundred twenty-six thousand, eight hundred fifty".