81423083028676 has 9 divisors (see below), whose sum is σ = 142490426882349. Its totient is φ = 40711532490864.

The previous prime is 81423083028647. The next prime is 81423083028713. The reversal of 81423083028676 is 67682038032418.

It is a happy number.

The square root of 81423083028676 is 9023474.

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., 81397025320900 + 26057707776 = 9022030^2 + 161424^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81423083028676.

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 2 ways as a sum of consecutive naturals, for example, 15791080 + ... + 20302816.

Almost surely, 2^{81423083028676} is an apocalyptic number.

81423083028676 is the 9023474-th square number.

It is an amenable number.

81423083028676 is a deficient number, since it is larger than the sum of its proper divisors (61067343853673).

81423083028676 is an frugal number, since it uses more digits than its factorization.

81423083028676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9023478 (or 4511739 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 58.

The spelling of 81423083028676 in words is "eighty-one trillion, four hundred twenty-three billion, eighty-three million, twenty-eight thousand, six hundred seventy-six".