646088 has 8 divisors (see below), whose sum is σ = 1211430. Its totient is φ = 323040.

The previous prime is 646073. The next prime is 646099. The reversal of 646088 is 880646.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 40804 = 778^2 + 202^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

646088 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 40373 + ... + 40388.

2⁶⁴⁶⁰⁸⁸ is an apocalyptic number.

It is an amenable number.

646088 is a deficient number, since it is larger than the sum of its proper divisors (565342).

646088 is a wasteful number, since it uses less digits than its factorization.

646088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80767 (or 80763 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 646088 is about 803.7959940184. The cubic root of 646088 is about 86.4497798412.

The spelling of 646088 in words is "six hundred forty-six thousand, eighty-eight".