646941286 has 16 divisors (see below), whose sum is σ = 1017160704. Its totient is φ = 308014344.

The previous prime is 646941187. The next prime is 646941289. The reversal of 646941286 is 682149646.

646941286 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646941289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21276 + ... + 41791.

It is an arithmetic number, because the mean of its divisors is an integer number (63572544).

Almost surely, 2^646941286 is an apocalyptic number.

646941286 is a deficient number, since it is larger than the sum of its proper divisors (370219418).

646941286 is a wasteful number, since it uses less digits than its factorization.

646941286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63315.

The product of its digits is 497664, while the sum is 46.

The square root of 646941286 is about 25435.0405150061. The cubic root of 646941286 is about 864.8782106590.

The spelling of 646941286 in words is "six hundred forty-six million, nine hundred forty-one thousand, two hundred eighty-six".