646671 has 8 divisors (see below), whose sum is σ = 892080. Its totient is φ = 416192.

The previous prime is 646669. The next prime is 646687. The reversal of 646671 is 176646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646671 - 2¹ = 646669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3630 + ... + 3803.

It is an arithmetic number, because the mean of its divisors is an integer number (111510).

2⁶⁴⁶⁶⁷¹ is an apocalyptic number.

646671 is a deficient number, since it is larger than the sum of its proper divisors (245409).

646671 is a wasteful number, since it uses less digits than its factorization.

646671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7465.

The product of its digits is 6048, while the sum is 30.

The square root of 646671 is about 804.1585664532. The cubic root of 646671 is about 86.4757747881.

The spelling of 646671 in words is "six hundred forty-six thousand, six hundred seventy-one".