646043472 has 160 divisors (see below), whose sum is σ = 2015744000. Its totient is φ = 197354880.

The previous prime is 646043393. The next prime is 646043473. The reversal of 646043472 is 274340646.

646043472 is a `hidden beast` number, since 6 + 4 + 604 + 3 + 47 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646043473) 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 31 ways as a sum of consecutive naturals, for example, 253179 + ... + 255717.

It is an arithmetic number, because the mean of its divisors is an integer number (12598400).

Almost surely, 2^646043472 is an apocalyptic number.

646043472 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646043472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1007872000).

646043472 is an abundant number, since it is smaller than the sum of its proper divisors (1369700528).

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

646043472 is a wasteful number, since it uses less digits than its factorization.

646043472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606 (or 2594 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

The square root of 646043472 is about 25417.3852313726. The cubic root of 646043472 is about 864.4779377316.

The spelling of 646043472 in words is "six hundred forty-six million, forty-three thousand, four hundred seventy-two".