81082856 has 16 divisors (see below), whose sum is σ = 156935040. Its totient is φ = 39233520.

The previous prime is 81082853. The next prime is 81082867. The reversal of 81082856 is 65828018.

It is not an unprimeable number, because it can be changed into a prime (81082853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163226 + ... + 163721.

It is an arithmetic number, because the mean of its divisors is an integer number (9808440).

Almost surely, 2^81082856 is an apocalyptic number.

It is an amenable number.

81082856 is a deficient number, since it is larger than the sum of its proper divisors (75852184).

81082856 is a wasteful number, since it uses less digits than its factorization.

81082856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326984 (or 326980 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 81082856 is about 9004.6019345666. The cubic root of 81082856 is about 432.8223504846.

The spelling of 81082856 in words is "eighty-one million, eighty-two thousand, eight hundred fifty-six".