646677 has 16 divisors (see below), whose sum is σ = 982080. Its totient is φ = 420336.

The previous prime is 646669. The next prime is 646687. The reversal of 646677 is 776646.

646677 is a `hidden beast` number, since 646 + 6 + 7 + 7 = 666.

It is not a de Polignac number, because 646677 - 2³ = 646669 is a prime.

It is a super-2 number, since 2×646677² = 836382284658, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646677.

It is not an unprimeable number, because it can be changed into a prime (646637) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 883 + ... + 1439.

It is an arithmetic number, because the mean of its divisors is an integer number (61380).

2⁶⁴⁶⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

646677 is a deficient number, since it is larger than the sum of its proper divisors (335403).

646677 is a wasteful number, since it uses less digits than its factorization.

646677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 603 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 646677 is about 804.1622970520. The cubic root of 646677 is about 86.4760422363.

The spelling of 646677 in words is "six hundred forty-six thousand, six hundred seventy-seven".