81796712 has 8 divisors (see below), whose sum is σ = 153368850. Its totient is φ = 40898352.

The previous prime is 81796699. The next prime is 81796721. The reversal of 81796712 is 21769718.

It can be written as a sum of positive squares in only one way, i.e., 76983076 + 4813636 = 8774^2 + 2194^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×81796712³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81796712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5112287 + ... + 5112302.

Almost surely, 2^81796712 is an apocalyptic number.

It is an amenable number.

81796712 is a deficient number, since it is larger than the sum of its proper divisors (71572138).

81796712 is a wasteful number, since it uses less digits than its factorization.

81796712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10224595 (or 10224591 counting only the distinct ones).

The product of its digits is 42336, while the sum is 41.

The square root of 81796712 is about 9044.1534706129. The cubic root of 81796712 is about 434.0888348383.

The spelling of 81796712 in words is "eighty-one million, seven hundred ninety-six thousand, seven hundred twelve".