81933066 has 16 divisors (see below), whose sum is σ = 182073600. Its totient is φ = 27311004.

The previous prime is 81933043. The next prime is 81933097. The reversal of 81933066 is 66033918.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81933066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758586 + ... + 758693.

It is an arithmetic number, because the mean of its divisors is an integer number (11379600).

Almost surely, 2^81933066 is an apocalyptic number.

81933066 is an abundant number, since it is smaller than the sum of its proper divisors (100140534).

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

81933066 is a wasteful number, since it uses less digits than its factorization.

81933066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517290 (or 1517284 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 81933066 is about 9051.6885717528. The cubic root of 81933066 is about 434.3299076494.

The spelling of 81933066 in words is "eighty-one million, nine hundred thirty-three thousand, sixty-six".