643528284 has 48 divisors (see below), whose sum is σ = 1744221696. Its totient is φ = 180849600.

The previous prime is 643528283. The next prime is 643528297. The reversal of 643528284 is 482825346.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643528283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57672 + ... + 67919.

It is an arithmetic number, because the mean of its divisors is an integer number (36337952).

Almost surely, 2^643528284 is an apocalyptic number.

It is an amenable number.

643528284 is an abundant number, since it is smaller than the sum of its proper divisors (1100693412).

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

643528284 is a wasteful number, since it uses less digits than its factorization.

643528284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125666 (or 125664 counting only the distinct ones).

The product of its digits is 368640, while the sum is 42.

The square root of 643528284 is about 25367.8592711328. The cubic root of 643528284 is about 863.3546116939.

The spelling of 643528284 in words is "six hundred forty-three million, five hundred twenty-eight thousand, two hundred eighty-four".