4218574644 has 36 divisors (see below), whose sum is σ = 10864824516. Its totient is φ = 1379659008.

The previous prime is 4218574609. The next prime is 4218574651. The reversal of 4218574644 is 4464758124.

4218574644 is a `hidden beast` number, since 4 + 2 + 18 + 574 + 64 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2041232400 + 2177342244 = 45180^2 + 46662^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 4218574644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1103589 + ... + 1107404.

It is an arithmetic number, because the mean of its divisors is an integer number (301800681).

Almost surely, 2^4218574644 is an apocalyptic number.

It is an amenable number.

4218574644 is an abundant number, since it is smaller than the sum of its proper divisors (6646249872).

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

4218574644 is a wasteful number, since it uses less digits than its factorization.

4218574644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211056 (or 2211051 counting only the distinct ones).

The product of its digits is 860160, while the sum is 45.

The square root of 4218574644 is about 64950.5553786879. Note that the first 3 decimals coincide. The cubic root of 4218574644 is about 1615.8036294775.

The spelling of 4218574644 in words is "four billion, two hundred eighteen million, five hundred seventy-four thousand, six hundred forty-four".