81038038764 has 48 divisors (see below), whose sum is σ = 190412056800. Its totient is φ = 26823853056.

The previous prime is 81038038721. The next prime is 81038038801. The reversal of 81038038764 is 46783083018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3207172 + ... + 3232340.

It is an arithmetic number, because the mean of its divisors is an integer number (3966917850).

Almost surely, 2^81038038764 is an apocalyptic number.

It is an amenable number.

81038038764 is an abundant number, since it is smaller than the sum of its proper divisors (109374018036).

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

81038038764 is a wasteful number, since it uses less digits than its factorization.

81038038764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27042 (or 27040 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 81038038764 in words is "eighty-one billion, thirty-eight million, thirty-eight thousand, seven hundred sixty-four".