81076612 has 6 divisors (see below), whose sum is σ = 141884078. Its totient is φ = 40538304.

The previous prime is 81076607. The next prime is 81076613. The reversal of 81076612 is 21667018.

It can be written as a sum of positive squares in only one way, i.e., 62980096 + 18096516 = 7936^2 + 4254^2 .

It is not an unprimeable number, because it can be changed into a prime (81076613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134573 + ... + 10134580.

Almost surely, 2^81076612 is an apocalyptic number.

It is an amenable number.

81076612 is a deficient number, since it is larger than the sum of its proper divisors (60807466).

81076612 is a wasteful number, since it uses less digits than its factorization.

81076612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20269157 (or 20269155 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81076612 is about 9004.2552162852. The cubic root of 81076612 is about 432.8112399890.

The spelling of 81076612 in words is "eighty-one million, seventy-six thousand, six hundred twelve".