181280072 has 16 divisors (see below), whose sum is σ = 340094700. Its totient is φ = 90588160.

The previous prime is 181280069. The next prime is 181280101. The reversal of 181280072 is 270082181.

It can be written as a sum of positive squares in 2 ways, for example, as 158105476 + 23174596 = 12574^2 + 4814^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11204 + ... + 22092.

Almost surely, 2^181280072 is an apocalyptic number.

It is an amenable number.

181280072 is a deficient number, since it is larger than the sum of its proper divisors (158814628).

181280072 is a wasteful number, since it uses less digits than its factorization.

181280072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12976 (or 12972 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 181280072 is about 13464.0288175568. The cubic root of 181280072 is about 565.9568946683.

The spelling of 181280072 in words is "one hundred eighty-one million, two hundred eighty thousand, seventy-two".