646785746 has 16 divisors (see below), whose sum is σ = 975465024. Its totient is φ = 321635664.

The previous prime is 646785743. The next prime is 646785749. The reversal of 646785746 is 647587646.

It is an interprime number because it is at equal distance from previous prime (646785743) and next prime (646785749).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (646785743) 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, 495731 + ... + 497033.

It is an arithmetic number, because the mean of its divisors is an integer number (60966564).

Almost surely, 2^646785746 is an apocalyptic number.

646785746 is a deficient number, since it is larger than the sum of its proper divisors (328679278).

646785746 is a wasteful number, since it uses less digits than its factorization.

646785746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465.

The product of its digits is 6773760, while the sum is 53.

The square root of 646785746 is about 25431.9827382766. The cubic root of 646785746 is about 864.8088927049.

The spelling of 646785746 in words is "six hundred forty-six million, seven hundred eighty-five thousand, seven hundred forty-six".