81206761024 has 63 divisors (see below), whose sum is σ = 162868358667. Its totient is φ = 40173648768.

The previous prime is 81206760953. The next prime is 81206761063. The reversal of 81206761024 is 42016760218.

The square root of 81206761024 is 284968.

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 8 ways as a sum of consecutive naturals, for example, 408074077 + ... + 408074275.

Almost surely, 2^81206761024 is an apocalyptic number.

81206761024 is the 284968-th square number.

It is an amenable number.

81206761024 is an abundant number, since it is smaller than the sum of its proper divisors (81661597643).

81206761024 is an frugal number, since it uses more digits than its factorization.

81206761024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 81206761024 in words is "eighty-one billion, two hundred six million, seven hundred sixty-one thousand, twenty-four".