646488882 has 54 divisors (see below), whose sum is σ = 1520059671. Its totient is φ = 198488160.

The previous prime is 646488877. The next prime is 646488893. The reversal of 646488882 is 288884646.

It can be written as a sum of positive squares in 5 ways, for example, as 28419561 + 618069321 = 5331^2 + 24861^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17979.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1402132 + ... + 1402592.

Almost surely, 2^646488882 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646488882

646488882 is an abundant number, since it is smaller than the sum of its proper divisors (873570789).

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

646488882 is a wasteful number, since it uses less digits than its factorization.

646488882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956 (or 479 counting only the distinct ones).

The product of its digits is 4718592, while the sum is 54.

The square root of 646488882 is about 25426.1456379059. The cubic root of 646488882 is about 864.6765614463.

The spelling of 646488882 in words is "six hundred forty-six million, four hundred eighty-eight thousand, eight hundred eighty-two".