643151072 has 48 divisors (see below), whose sum is σ = 1343164032. Its totient is φ = 302100480.

The previous prime is 643151071. The next prime is 643151111. The reversal of 643151072 is 270151346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643151071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538508 + ... + 539700.

It is an arithmetic number, because the mean of its divisors is an integer number (27982584).

Almost surely, 2^643151072 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 643151072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671582016).

643151072 is an abundant number, since it is smaller than the sum of its proper divisors (700012960).

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

643151072 is a wasteful number, since it uses less digits than its factorization.

643151072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211 (or 2203 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 643151072 is about 25360.4233403151. The cubic root of 643151072 is about 863.1858900905.

The spelling of 643151072 in words is "six hundred forty-three million, one hundred fifty-one thousand, seventy-two".