81872716 has 6 divisors (see below), whose sum is σ = 143277260. Its totient is φ = 40936356.

The previous prime is 81872711. The next prime is 81872719. The reversal of 81872716 is 61727818.

It is not an unprimeable number, because it can be changed into a prime (81872711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10234086 + ... + 10234093.

Almost surely, 2^81872716 is an apocalyptic number.

It is an amenable number.

81872716 is a deficient number, since it is larger than the sum of its proper divisors (61404544).

81872716 is a wasteful number, since it uses less digits than its factorization.

81872716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20468183 (or 20468181 counting only the distinct ones).

The product of its digits is 37632, while the sum is 40.

The square root of 81872716 is about 9048.3543255114. The cubic root of 81872716 is about 434.2232423371.

The spelling of 81872716 in words is "eighty-one million, eight hundred seventy-two thousand, seven hundred sixteen".