81038147584 has 69 divisors (see below), whose sum is σ = 163250680827. Its totient is φ = 40227569664.

The previous prime is 81038147579. The next prime is 81038147599. The reversal of 81038147584 is 48574183018.

The square root of 81038147584 is 284672.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 583008187 + ... + 583008325.

Almost surely, 2^81038147584 is an apocalyptic number.

81038147584 is the 284672-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81038147584

81038147584 is an abundant number, since it is smaller than the sum of its proper divisors (82212533243).

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

81038147584 is an frugal number, since it uses more digits than its factorization.

81038147584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 49.

Multiplying 81038147584 by its sum of digits (49), we get a square (3970869231616 = 1992704²).

The spelling of 81038147584 in words is "eighty-one billion, thirty-eight million, one hundred forty-seven thousand, five hundred eighty-four".