646970 has 16 divisors (see below), whose sum is σ = 1202688. Its totient is φ = 250320.

The previous prime is 646957. The next prime is 646979. The reversal of 646970 is 79646.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646970.

It is not an unprimeable number, because it can be changed into a prime (646979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (75168).

2⁶⁴⁶⁹⁷⁰ is an apocalyptic number.

646970 is a deficient number, since it is larger than the sum of its proper divisors (555718).

646970 is a wasteful number, since it uses less digits than its factorization.

646970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 646970 is about 804.3444535769. The cubic root of 646970 is about 86.4891006125.

The spelling of 646970 in words is "six hundred forty-six thousand, nine hundred seventy".