82181994 has 8 divisors (see below), whose sum is σ = 164364000. Its totient is φ = 27393996.

The previous prime is 82181947. The next prime is 82182007. The reversal of 82181994 is 49918128.

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

82181994 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6848494 + ... + 6848505.

It is an arithmetic number, because the mean of its divisors is an integer number (20545500).

Almost surely, 2^82181994 is an apocalyptic number.

82181994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82181994 is a wasteful number, since it uses less digits than its factorization.

82181994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13697004.

The product of its digits is 41472, while the sum is 42.

The square root of 82181994 is about 9065.4285061435. The cubic root of 82181994 is about 434.7693214777.

The spelling of 82181994 in words is "eighty-two million, one hundred eighty-one thousand, nine hundred ninety-four".