222729988644 has 72 divisors (see below), whose sum is σ = 583185603000. Its totient is φ = 71589740544.

The previous prime is 222729988609. The next prime is 222729988661. The reversal of 222729988644 is 446889927222.

222729988644 is a `hidden beast` number, since 2 + 227 + 299 + 8 + 86 + 44 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 181926144 + 222548062500 = 13488^2 + 471750^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 664122 + ... + 941550.

Almost surely, 2^222729988644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222729988644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291592801500).

222729988644 is an abundant number, since it is smaller than the sum of its proper divisors (360455614356).

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

222729988644 is a wasteful number, since it uses less digits than its factorization.

222729988644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278237 (or 278232 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 63.

The spelling of 222729988644 in words is "two hundred twenty-two billion, seven hundred twenty-nine million, nine hundred eighty-eight thousand, six hundred forty-four".