181228072 has 32 divisors (see below), whose sum is σ = 354742920. Its totient is φ = 86711040.

The previous prime is 181228067. The next prime is 181228079. The reversal of 181228072 is 270822181.

It can be written as a sum of positive squares in 4 ways, for example, as 131469156 + 49758916 = 11466^2 + 7054^2 .

It is a super-2 number, since 2×181228072² = 65687228161674368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181228079) 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, 13038 + ... + 23074.

Almost surely, 2^181228072 is an apocalyptic number.

It is an amenable number.

181228072 is a deficient number, since it is larger than the sum of its proper divisors (173514848).

181228072 is a wasteful number, since it uses less digits than its factorization.

181228072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10141 (or 10137 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 181228072 is about 13462.0976077282. The cubic root of 181228072 is about 565.9027747778.

The spelling of 181228072 in words is "one hundred eighty-one million, two hundred twenty-eight thousand, seventy-two".