646740306 has 12 divisors (see below), whose sum is σ = 1401270702. Its totient is φ = 215580096.

The previous prime is 646740301. The next prime is 646740313. The reversal of 646740306 is 603047646.

646740306 is a `hidden beast` number, since 646 + 7 + 4 + 0 + 3 + 0 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 576432081 + 70308225 = 24009^2 + 8385^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (646740301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17964991 + ... + 17965026.

Almost surely, 2^646740306 is an apocalyptic number.

646740306 is an abundant number, since it is smaller than the sum of its proper divisors (754530396).

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

646740306 is a wasteful number, since it uses less digits than its factorization.

646740306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35930025 (or 35930022 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 646740306 is about 25431.0893592862. The cubic root of 646740306 is about 864.7886398176.

The spelling of 646740306 in words is "six hundred forty-six million, seven hundred forty thousand, three hundred six".