643533152 has 12 divisors (see below), whose sum is σ = 1266955956. Its totient is φ = 321766560.

The previous prime is 643533151. The next prime is 643533161. The reversal of 643533152 is 251335346.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 20110411 = 643533152 / (6 + 4 + 3 + 5 + 3 + 3 + 1 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643533151) 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 as a sum of consecutive naturals, namely, 10055174 + ... + 10055237.

It is an arithmetic number, because the mean of its divisors is an integer number (105579663).

Almost surely, 2^643533152 is an apocalyptic number.

It is an amenable number.

643533152 is a deficient number, since it is larger than the sum of its proper divisors (623422804).

643533152 is a wasteful number, since it uses less digits than its factorization.

643533152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20110421 (or 20110413 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

The square root of 643533152 is about 25367.9552191342. The cubic root of 643533152 is about 863.3567886507.

Adding to 643533152 its reverse (251335346), we get a palindrome (894868498).

The spelling of 643533152 in words is "six hundred forty-three million, five hundred thirty-three thousand, one hundred fifty-two".