81882681 has 8 divisors (see below), whose sum is σ = 109221504. Its totient is φ = 54566160.

The previous prime is 81882641. The next prime is 81882743. The reversal of 81882681 is 18628818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81882681 - 2⁹ = 81882169 is a prime.

It is a super-2 number, since 2×81882681² = 13409546895495522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81882641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7135 + ... + 14651.

It is an arithmetic number, because the mean of its divisors is an integer number (13652688).

Almost surely, 2^81882681 is an apocalyptic number.

It is an amenable number.

81882681 is a deficient number, since it is larger than the sum of its proper divisors (27338823).

81882681 is a wasteful number, since it uses less digits than its factorization.

81882681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11151.

The product of its digits is 49152, while the sum is 42.

The square root of 81882681 is about 9048.9049613752. The cubic root of 81882681 is about 434.2408585397.

The spelling of 81882681 in words is "eighty-one million, eight hundred eighty-two thousand, six hundred eighty-one".