646596 has 24 divisors (see below), whose sum is σ = 1676640. Its totient is φ = 215496.

The previous prime is 646577. The next prime is 646609. The reversal of 646596 is 695646.

It is a happy number.

646596 is a `hidden beast` number, since 64 + 6 + 596 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 646596.

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 7 ways as a sum of consecutive naturals, for example, 2886 + ... + 3101.

It is an arithmetic number, because the mean of its divisors is an integer number (69860).

2⁶⁴⁶⁵⁹⁶ is an apocalyptic number.

It is an amenable number.

646596 is an abundant number, since it is smaller than the sum of its proper divisors (1030044).

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

646596 is a wasteful number, since it uses less digits than its factorization.

646596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000 (or 5992 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 646596 is about 804.1119325069. Note that the first 3 decimals coincide. The cubic root of 646596 is about 86.4724315456.

It can be divided in two parts, 6465 and 96, that added together give a 8-th power (6561 = 3⁸).

The spelling of 646596 in words is "six hundred forty-six thousand, five hundred ninety-six".