81828078 has 16 divisors (see below), whose sum is σ = 166744656. Its totient is φ = 26761280.

The previous prime is 81828073. The next prime is 81828101. The reversal of 81828078 is 87082818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81828073) 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 7 ways as a sum of consecutive naturals, for example, 128343 + ... + 128978.

It is an arithmetic number, because the mean of its divisors is an integer number (10421541).

Almost surely, 2^81828078 is an apocalyptic number.

81828078 is an abundant number, since it is smaller than the sum of its proper divisors (84916578).

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

81828078 is a wasteful number, since it uses less digits than its factorization.

81828078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257379.

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 81828078 is about 9045.8873528250. The cubic root of 81828078 is about 434.1443133943.

The spelling of 81828078 in words is "eighty-one million, eight hundred twenty-eight thousand, seventy-eight".