646712 has 16 divisors (see below), whose sum is σ = 1323000. Its totient is φ = 293920.

The previous prime is 646687. The next prime is 646721. The reversal of 646712 is 217646.

It is a nialpdrome in base 15.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3587 + ... + 3762.

2⁶⁴⁶⁷¹² is an apocalyptic number.

It is an amenable number.

646712 is an abundant number, since it is smaller than the sum of its proper divisors (676288).

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

646712 is a wasteful number, since it uses less digits than its factorization.

646712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7366 (or 7362 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 646712 is about 804.1840585339. The cubic root of 646712 is about 86.4776023180.

It can be divided in two parts, 64 and 6712, that added together give a palindrome (6776).

The spelling of 646712 in words is "six hundred forty-six thousand, seven hundred twelve".