222535728 has 80 divisors (see below), whose sum is σ = 649660800. Its totient is φ = 72912960.

The previous prime is 222535727. The next prime is 222535783. The reversal of 222535728 is 827535222.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 222535692 and 222535701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222535727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21123 + ... + 29853.

It is an arithmetic number, because the mean of its divisors is an integer number (8120760).

Almost surely, 2^222535728 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 222535728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324830400).

222535728 is an abundant number, since it is smaller than the sum of its proper divisors (427125072).

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

222535728 is a wasteful number, since it uses less digits than its factorization.

222535728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8807 (or 8795 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 222535728 is about 14917.6314473847. The cubic root of 222535728 is about 605.9915693367.

The spelling of 222535728 in words is "two hundred twenty-two million, five hundred thirty-five thousand, seven hundred twenty-eight".