81730804996 has 27 divisors (see below), whose sum is σ = 143897658933. Its totient is φ = 40618682880.

The previous prime is 81730804963. The next prime is 81730804997. The reversal of 81730804996 is 69940803718.

The square root of 81730804996 is 285886.

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

It can be written as a sum of positive squares in only one way, i.e., 73774164996 + 7956640000 = 271614^2 + 89200^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81730804997) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 127504836 + ... + 127505476.

Almost surely, 2^81730804996 is an apocalyptic number.

81730804996 is the 285886-th square number.

It is an amenable number.

81730804996 is a deficient number, since it is larger than the sum of its proper divisors (62166853937).

81730804996 is an frugal number, since it uses more digits than its factorization.

81730804996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 81730804996 in words is "eighty-one billion, seven hundred thirty million, eight hundred four thousand, nine hundred ninety-six".