81428682 has 8 divisors (see below), whose sum is σ = 162857376. Its totient is φ = 27142892.

The previous prime is 81428663. The next prime is 81428719. The reversal of 81428682 is 28682418.

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

81428682 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81428682.

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 3 ways as a sum of consecutive naturals, for example, 6785718 + ... + 6785729.

It is an arithmetic number, because the mean of its divisors is an integer number (20357172).

Almost surely, 2^81428682 is an apocalyptic number.

81428682 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.

81428682 is a wasteful number, since it uses less digits than its factorization.

81428682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13571452.

The product of its digits is 49152, while the sum is 39.

The square root of 81428682 is about 9023.7842394419. The cubic root of 81428682 is about 433.4368203855.

The spelling of 81428682 in words is "eighty-one million, four hundred twenty-eight thousand, six hundred eighty-two".