81938708382 has 64 divisors (see below), whose sum is σ = 170644320000. Its totient is φ = 26206769664.

The previous prime is 81938708377. The next prime is 81938708393. The reversal of 81938708382 is 28380783918.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10922869 + ... + 10930367.

It is an arithmetic number, because the mean of its divisors is an integer number (2666317500).

Almost surely, 2^81938708382 is an apocalyptic number.

81938708382 is an abundant number, since it is smaller than the sum of its proper divisors (88705611618).

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

81938708382 is a wasteful number, since it uses less digits than its factorization.

81938708382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8217.

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 81938708382 in words is "eighty-one billion, nine hundred thirty-eight million, seven hundred eight thousand, three hundred eighty-two".