222689728 has 56 divisors (see below), whose sum is σ = 467360000. Its totient is φ = 104986368.

The previous prime is 222689723. The next prime is 222689741. The reversal of 222689728 is 827986222.

It is a happy number.

222689728 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222689723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446023 + ... + 446521.

Almost surely, 2^222689728 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 222689728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233680000).

222689728 is an abundant number, since it is smaller than the sum of its proper divisors (244670272).

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

222689728 is a wasteful number, since it uses less digits than its factorization.

222689728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897 (or 887 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 222689728 is about 14922.7922320188. The cubic root of 222689728 is about 606.1313239484.

The spelling of 222689728 in words is "two hundred twenty-two million, six hundred eighty-nine thousand, seven hundred twenty-eight".