81036029064 has 32 divisors (see below), whose sum is σ = 202818525120. Its totient is φ = 26981549376.

The previous prime is 81036029051. The next prime is 81036029089. The reversal of 81036029064 is 46092063018.

It is a super-2 number, since 2×81036029064² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1882039 + ... + 1924614.

It is an arithmetic number, because the mean of its divisors is an integer number (6338078910).

Almost surely, 2^81036029064 is an apocalyptic number.

It is an amenable number.

81036029064 is an abundant number, since it is smaller than the sum of its proper divisors (121782496056).

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

81036029064 is a wasteful number, since it uses less digits than its factorization.

81036029064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807549 (or 3807545 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 81036029064 in words is "eighty-one billion, thirty-six million, twenty-nine thousand, sixty-four".