646676 has 12 divisors (see below), whose sum is σ = 1137780. Its totient is φ = 321600.

The previous prime is 646669. The next prime is 646687. The reversal of 646676 is 676646.

646676 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 2 ways, for example, as 274576 + 372100 = 524^2 + 610^2 .

It is a congruent number.

It is an unprimeable number.

646676 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776 + ... + 1376.

It is an arithmetic number, because the mean of its divisors is an integer number (94815).

2⁶⁴⁶⁶⁷⁶ is an apocalyptic number.

It is an amenable number.

646676 is a deficient number, since it is larger than the sum of its proper divisors (491104).

646676 is a wasteful number, since it uses less digits than its factorization.

646676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 872 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 646676 is about 804.1616752868. The cubic root of 646676 is about 86.4759976617.

The spelling of 646676 in words is "six hundred forty-six thousand, six hundred seventy-six".