646485312 has 112 divisors (see below), whose sum is σ = 1916655552. Its totient is φ = 190586880.

The previous prime is 646485293. The next prime is 646485391. The reversal of 646485312 is 213584646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74008 + ... + 82280.

It is an arithmetic number, because the mean of its divisors is an integer number (17112996).

Almost surely, 2^646485312 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 646485312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958327776).

646485312 is an abundant number, since it is smaller than the sum of its proper divisors (1270170240).

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

646485312 is a wasteful number, since it uses less digits than its factorization.

646485312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8336 (or 8326 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 646485312 is about 25426.0754344826. The cubic root of 646485312 is about 864.6749698226.

The spelling of 646485312 in words is "six hundred forty-six million, four hundred eighty-five thousand, three hundred twelve".