643250196 has 36 divisors (see below), whose sum is σ = 1628457012. Its totient is φ = 214091904.

The previous prime is 643250191. The next prime is 643250197. The reversal of 643250196 is 691052346.

It is a happy number.

643250196 is a `hidden beast` number, since 64 + 3 + 2 + 501 + 96 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 514654596 + 128595600 = 22686^2 + 11340^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 643250196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643250191) 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 11 ways as a sum of consecutive naturals, for example, 11176 + ... + 37568.

It is an arithmetic number, because the mean of its divisors is an integer number (45234917).

Almost surely, 2^643250196 is an apocalyptic number.

It is an amenable number.

643250196 is an abundant number, since it is smaller than the sum of its proper divisors (985206816).

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

643250196 is a wasteful number, since it uses less digits than its factorization.

643250196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27080 (or 27075 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 643250196 is about 25362.3775699361. The cubic root of 643250196 is about 863.2302332454.

The spelling of 643250196 in words is "six hundred forty-three million, two hundred fifty thousand, one hundred ninety-six".