81667982 has 24 divisors (see below), whose sum is σ = 137951856. Its totient is φ = 36212000.

The previous prime is 81667951. The next prime is 81668033. The reversal of 81667982 is 28976618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5807 + ... + 14037.

It is an arithmetic number, because the mean of its divisors is an integer number (5747994).

Almost surely, 2^81667982 is an apocalyptic number.

81667982 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81667982 is a deficient number, since it is larger than the sum of its proper divisors (56283874).

81667982 is a wasteful number, since it uses less digits than its factorization.

81667982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8296 (or 8285 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 81667982 is about 9037.0339160590. The cubic root of 81667982 is about 433.8609952165.

The spelling of 81667982 in words is "eighty-one million, six hundred sixty-seven thousand, nine hundred eighty-two".