82186881 has 16 divisors (see below), whose sum is σ = 125385600. Its totient is φ = 46908288.

The previous prime is 82186877. The next prime is 82186901. The reversal of 82186881 is 18868128.

It is not a de Polignac number, because 82186881 - 2² = 82186877 is a prime.

It is a super-2 number, since 2×82186881² = 13509366817016322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82186861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21525 + ... + 25053.

It is an arithmetic number, because the mean of its divisors is an integer number (7836600).

Almost surely, 2^82186881 is an apocalyptic number.

It is an amenable number.

82186881 is a deficient number, since it is larger than the sum of its proper divisors (43198719).

82186881 is a wasteful number, since it uses less digits than its factorization.

82186881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4648.

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

The square root of 82186881 is about 9065.6980426220. The cubic root of 82186881 is about 434.7779392436. Note that the first 3 decimals are identical.

The spelling of 82186881 in words is "eighty-two million, one hundred eighty-six thousand, eight hundred eighty-one".