646626 has 16 divisors (see below), whose sum is σ = 1321344. Its totient is φ = 210864.

The previous prime is 646619. The next prime is 646631. The reversal of 646626 is 626646.

It is a junction number, because it is equal to n+sod(n) for n = 646593 and 646602.

It is an unprimeable number.

646626 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 7 ways as a sum of consecutive naturals, for example, 865 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (82584).

2⁶⁴⁶⁶²⁶ is an apocalyptic number.

646626 is an abundant number, since it is smaller than the sum of its proper divisors (674718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646626 is a wasteful number, since it uses less digits than its factorization.

646626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345.

The product of its digits is 10368, while the sum is 30.

The square root of 646626 is about 804.1305864099. The cubic root of 646626 is about 86.4737688736.

The spelling of 646626 in words is "six hundred forty-six thousand, six hundred twenty-six".