81382668 has 48 divisors (see below), whose sum is σ = 193546080. Its totient is φ = 26611200.

The previous prime is 81382667. The next prime is 81382673. The reversal of 81382668 is 86628318.

It is not an unprimeable number, because it can be changed into a prime (81382667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193098 + ... + 193518.

It is an arithmetic number, because the mean of its divisors is an integer number (4032210).

Almost surely, 2^81382668 is an apocalyptic number.

It is an amenable number.

81382668 is an abundant number, since it is smaller than the sum of its proper divisors (112163412).

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

81382668 is a wasteful number, since it uses less digits than its factorization.

81382668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 696 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 81382668 is about 9021.2342836222. The cubic root of 81382668 is about 433.3551623455.

The spelling of 81382668 in words is "eighty-one million, three hundred eighty-two thousand, six hundred sixty-eight".