81727276312 has 48 divisors (see below), whose sum is σ = 172736123400. Its totient is φ = 35950377600.

The previous prime is 81727276277. The next prime is 81727276313. The reversal of 81727276312 is 21367272718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81727276313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 398637 + ... + 567772.

Almost surely, 2^81727276312 is an apocalyptic number.

It is an amenable number.

81727276312 is an abundant number, since it is smaller than the sum of its proper divisors (91008847088).

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

81727276312 is a wasteful number, since it uses less digits than its factorization.

81727276312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966488 (or 966453 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The spelling of 81727276312 in words is "eighty-one billion, seven hundred twenty-seven million, two hundred seventy-six thousand, three hundred twelve".