646456306 has 16 divisors (see below), whose sum is σ = 990715320. Its totient is φ = 316293120.

The previous prime is 646456301. The next prime is 646456309. The reversal of 646456306 is 603654646.

It can be written as a sum of positive squares in 4 ways, for example, as 459888025 + 186568281 = 21445^2 + 13659^2 .

It is not an unprimeable number, because it can be changed into a prime (646456301) 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, 1455 + ... + 35986.

Almost surely, 2^646456306 is an apocalyptic number.

646456306 is a deficient number, since it is larger than the sum of its proper divisors (344259014).

646456306 is a wasteful number, since it uses less digits than its factorization.

646456306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37629.

The product of its (nonzero) digits is 311040, while the sum is 40.

The square root of 646456306 is about 25425.5050293991. The cubic root of 646456306 is about 864.6620377746.

The spelling of 646456306 in words is "six hundred forty-six million, four hundred fifty-six thousand, three hundred six".