646163472 has 80 divisors (see below), whose sum is σ = 1844346240. Its totient is φ = 193898496.

The previous prime is 646163467. The next prime is 646163503. The reversal of 646163472 is 274361646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 646163472.

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 15 ways as a sum of consecutive naturals, for example, 1554 + ... + 35982.

It is an arithmetic number, because the mean of its divisors is an integer number (23054328).

Almost surely, 2^646163472 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 646163472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922173120).

646163472 is an abundant number, since it is smaller than the sum of its proper divisors (1198182768).

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

646163472 is a wasteful number, since it uses less digits than its factorization.

646163472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34480 (or 34474 counting only the distinct ones).

The product of its digits is 145152, while the sum is 39.

The square root of 646163472 is about 25419.7457107659. The cubic root of 646163472 is about 864.5314588617.

The spelling of 646163472 in words is "six hundred forty-six million, one hundred sixty-three thousand, four hundred seventy-two".