81732272 has 10 divisors (see below), whose sum is σ = 158356308. Its totient is φ = 40866128.

The previous prime is 81732269. The next prime is 81732283. The reversal of 81732272 is 27223718.

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 as a sum of consecutive naturals, namely, 2554118 + ... + 2554149.

Almost surely, 2^81732272 is an apocalyptic number.

It is an amenable number.

81732272 is a deficient number, since it is larger than the sum of its proper divisors (76624036).

81732272 is a wasteful number, since it uses less digits than its factorization.

81732272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108275 (or 5108269 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 81732272 is about 9040.5902462173. The cubic root of 81732272 is about 433.9748121890.

The spelling of 81732272 in words is "eighty-one million, seven hundred thirty-two thousand, two hundred seventy-two".