81016772 has 12 divisors (see below), whose sum is σ = 141851136. Its totient is φ = 40487880.

The previous prime is 81016769. The next prime is 81016783. The reversal of 81016772 is 27761018.

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, 6893 + ... + 14475.

It is an arithmetic number, because the mean of its divisors is an integer number (11820928).

Almost surely, 2^81016772 is an apocalyptic number.

It is an amenable number.

81016772 is a deficient number, since it is larger than the sum of its proper divisors (60834364).

81016772 is a wasteful number, since it uses less digits than its factorization.

81016772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10258 (or 10256 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 81016772 is about 9000.9317295489. The cubic root of 81016772 is about 432.7047325001.

The spelling of 81016772 in words is "eighty-one million, sixteen thousand, seven hundred seventy-two".