222720 has 80 divisors (see below), whose sum is σ = 736560. Its totient is φ = 57344.

The previous prime is 222713. The next prime is 222731. The reversal of 222720 is 27222.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 222720.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 222720.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7666 + ... + 7694.

It is an arithmetic number, because the mean of its divisors is an integer number (9207).

2²²²⁷²⁰ is an apocalyptic number.

222720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368280).

222720 is an abundant number, since it is smaller than the sum of its proper divisors (513840).

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

222720 is an equidigital number, since it uses as much as digits as its factorization.

222720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 222720 is about 471.9321985201. The cubic root of 222720 is about 60.6158788134.

Adding to 222720 its reverse (27222), we get a palindrome (249942).

It can be divided in two parts, 2 and 22720, that added together give a palindrome (22722).

The spelling of 222720 in words is "two hundred twenty-two thousand, seven hundred twenty", and thus it is an iban number.