646587708 has 144 divisors (see below), whose sum is σ = 1775007360. Its totient is φ = 181595520.

The previous prime is 646587659. The next prime is 646587709. The reversal of 646587708 is 807785646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646587709) 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 47 ways as a sum of consecutive naturals, for example, 2848291 + ... + 2848517.

It is an arithmetic number, because the mean of its divisors is an integer number (12326440).

Almost surely, 2^646587708 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646587708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887503680).

646587708 is an abundant number, since it is smaller than the sum of its proper divisors (1128419652).

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

646587708 is a wasteful number, since it uses less digits than its factorization.

646587708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The square root of 646587708 is about 25428.0889568996. The cubic root of 646587708 is about 864.7206190083.

The spelling of 646587708 in words is "six hundred forty-six million, five hundred eighty-seven thousand, seven hundred eight".