646705733 has 4 divisors (see below), whose sum is σ = 647696748. Its totient is φ = 645714720.

The previous prime is 646705729. The next prime is 646705757. The reversal of 646705733 is 337507646.

646705733 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 can be written as a sum of positive squares in 2 ways, for example, as 277988929 + 368716804 = 16673^2 + 19202^2 .

It is a cyclic number.

It is not a de Polignac number, because 646705733 - 2² = 646705729 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646705723) 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, 494528 + ... + 495833.

It is an arithmetic number, because the mean of its divisors is an integer number (161924187).

Almost surely, 2^646705733 is an apocalyptic number.

It is an amenable number.

646705733 is a deficient number, since it is larger than the sum of its proper divisors (991015).

646705733 is an equidigital number, since it uses as much as digits as its factorization.

646705733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991014.

The product of its (nonzero) digits is 317520, while the sum is 41.

The square root of 646705733 is about 25430.4096113295. The cubic root of 646705733 is about 864.7732297836.

The spelling of 646705733 in words is "six hundred forty-six million, seven hundred five thousand, seven hundred thirty-three".