646479 has 12 divisors (see below), whose sum is σ = 943800. Its totient is φ = 426384.

The previous prime is 646453. The next prime is 646519. The reversal of 646479 is 974646.

646479 is a `hidden beast` number, since 6 + 4 + 647 + 9 = 666.

It is not a de Polignac number, because 646479 - 2¹¹ = 644431 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 646479.

It is not an unprimeable number, because it can be changed into a prime (646379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 652 + ... + 1310.

It is an arithmetic number, because the mean of its divisors is an integer number (78650).

2⁶⁴⁶⁴⁷⁹ is an apocalyptic number.

646479 is a deficient number, since it is larger than the sum of its proper divisors (297321).

646479 is a wasteful number, since it uses less digits than its factorization.

646479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774 (or 771 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 646479 is about 804.0391781499. The cubic root of 646479 is about 86.4672155711.

The spelling of 646479 in words is "six hundred forty-six thousand, four hundred seventy-nine".