72222280 has 32 divisors (see below), whose sum is σ = 175001400. Its totient is φ = 26666496.

The previous prime is 72222263. The next prime is 72222289. The reversal of 72222280 is 8222227.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18610596 + 53611684 = 4314^2 + 7322^2 .

It is not an unprimeable number, because it can be changed into a prime (72222289) 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, 68925 + ... + 69964.

Almost surely, 2^72222280 is an apocalyptic number.

It is an amenable number.

72222280 is an abundant number, since it is smaller than the sum of its proper divisors (102779120).

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

72222280 is a wasteful number, since it uses less digits than its factorization.

72222280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138913 (or 138909 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 72222280 is about 8498.3692553336. The cubic root of 72222280 is about 416.4444368723. Note that the first 4 decimals are identical.

The spelling of 72222280 in words is "seventy-two million, two hundred twenty-two thousand, two hundred eighty".