646740307 has 4 divisors (see below), whose sum is σ = 647817016. Its totient is φ = 645663600.

The previous prime is 646740301. The next prime is 646740313. The reversal of 646740307 is 703047646.

646740307 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (646740301) and next prime (646740313).

It is a cyclic number.

It is not a de Polignac number, because 646740307 - 2⁷ = 646740179 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 537453 + ... + 538654.

It is an arithmetic number, because the mean of its divisors is an integer number (161954254).

Almost surely, 2^646740307 is an apocalyptic number.

646740307 is a deficient number, since it is larger than the sum of its proper divisors (1076709).

646740307 is a wasteful number, since it uses less digits than its factorization.

646740307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076708.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 646740307 is about 25431.0893789472. The cubic root of 646740307 is about 864.7886402634.

The spelling of 646740307 in words is "six hundred forty-six million, seven hundred forty thousand, three hundred seven".