222187728 has 80 divisors (see below), whose sum is σ = 684527616. Its totient is φ = 60720000.

The previous prime is 222187727. The next prime is 222187741. The reversal of 222187728 is 827781222.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222187727) 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 15 ways as a sum of consecutive naturals, for example, 6648 + ... + 22103.

Almost surely, 2^222187728 is an apocalyptic number.

222187728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

222187728 is an abundant number, since it is smaller than the sum of its proper divisors (462339888).

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

222187728 is a wasteful number, since it uses less digits than its factorization.

222187728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28792 (or 28786 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 222187728 is about 14905.9628337119. The cubic root of 222187728 is about 605.6755225749.

The spelling of 222187728 in words is "two hundred twenty-two million, one hundred eighty-seven thousand, seven hundred twenty-eight".