646244 has 6 divisors (see below), whose sum is σ = 1130934. Its totient is φ = 323120.

The previous prime is 646237. The next prime is 646253. The reversal of 646244 is 442646.

646244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 68644 = 760^2 + 262^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80777 + ... + 80784.

It is an arithmetic number, because the mean of its divisors is an integer number (188489).

2⁶⁴⁶²⁴⁴ is an apocalyptic number.

It is an amenable number.

646244 is a deficient number, since it is larger than the sum of its proper divisors (484690).

646244 is a wasteful number, since it uses less digits than its factorization.

646244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161565 (or 161563 counting only the distinct ones).

The product of its digits is 4608, while the sum is 26.

The square root of 646244 is about 803.8930277095. The cubic root of 646244 is about 86.4567371393.

The spelling of 646244 in words is "six hundred forty-six thousand, two hundred forty-four".