646730 has 16 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 221712.

The previous prime is 646721. The next prime is 646757. The reversal of 646730 is 37646.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 646730.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4550 + ... + 4689.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2⁶⁴⁶⁷³⁰ is an apocalyptic number.

646730 is an abundant number, since it is smaller than the sum of its proper divisors (683830).

It is a weird number, because it is abundant, but not a pseudoperfect number.

646730 is a wasteful number, since it uses less digits than its factorization.

646730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9253.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 646730 is about 804.1952499238. The cubic root of 646730 is about 86.4784046238.

The spelling of 646730 in words is "six hundred forty-six thousand, seven hundred thirty".