643473528 has 96 divisors (see below), whose sum is σ = 1726101360. Its totient is φ = 199843840.

The previous prime is 643473527. The next prime is 643473683. The reversal of 643473528 is 825374346.

It is a self number, because there is not a number n which added to its sum of digits gives 643473528.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643473521) 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 23 ways as a sum of consecutive naturals, for example, 783358 + ... + 784178.

Almost surely, 2^643473528 is an apocalyptic number.

643473528 is a gapful number since it is divisible by the number (68) 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 643473528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863050680).

643473528 is an abundant number, since it is smaller than the sum of its proper divisors (1082627832).

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

643473528 is a wasteful number, since it uses less digits than its factorization.

643473528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 956 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The square root of 643473528 is about 25366.7800085072. The cubic root of 643473528 is about 863.3301241994.

The spelling of 643473528 in words is "six hundred forty-three million, four hundred seventy-three thousand, five hundred twenty-eight".