646672 has 20 divisors (see below), whose sum is σ = 1349740. Its totient is φ = 298368.

The previous prime is 646669. The next prime is 646687. The reversal of 646672 is 276646.

It can be written as a sum of positive squares in 2 ways, for example, as 104976 + 541696 = 324^2 + 736^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1347 + ... + 1762.

It is an arithmetic number, because the mean of its divisors is an integer number (67487).

2⁶⁴⁶⁶⁷² is an apocalyptic number.

It is an amenable number.

646672 is an abundant number, since it is smaller than the sum of its proper divisors (703068).

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

646672 is a wasteful number, since it uses less digits than its factorization.

646672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130 (or 3124 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 646672 is about 804.1591882208. The cubic root of 646672 is about 86.4758193629.

The spelling of 646672 in words is "six hundred forty-six thousand, six hundred seventy-two".