643570752 has 112 divisors (see below), whose sum is σ = 1864425024. Its totient is φ = 194304000.

The previous prime is 643570747. The next prime is 643570769. The reversal of 643570752 is 257075346.

It is a self number, because there is not a number n which added to its sum of digits gives 643570752.

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, 973302 + ... + 973962.

It is an arithmetic number, because the mean of its divisors is an integer number (16646652).

Almost surely, 2^643570752 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 643570752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (932212512).

643570752 is an abundant number, since it is smaller than the sum of its proper divisors (1220854272).

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

643570752 is a wasteful number, since it uses less digits than its factorization.

643570752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 1138 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 643570752 is about 25368.6963007562. The cubic root of 643570752 is about 863.3736029013.

The spelling of 643570752 in words is "six hundred forty-three million, five hundred seventy thousand, seven hundred fifty-two".