81228938811072 has 112 divisors (see below), whose sum is σ = 231453191286240. Its totient is φ = 24993218838528.

The previous prime is 81228938811071. The next prime is 81228938811151. The reversal of 81228938811072 is 27011883982218.

It is a junction number, because it is equal to n+sod(n) for n = 81228938810997 and 81228938811015.

It is not an unprimeable number, because it can be changed into a prime (81228938811071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298467954 + ... + 298739982.

It is an arithmetic number, because the mean of its divisors is an integer number (2066546350770).

Almost surely, 2^{81228938811072} is an apocalyptic number.

It is an amenable number.

81228938811072 is an abundant number, since it is smaller than the sum of its proper divisors (150224252475168).

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

81228938811072 is a wasteful number, since it uses less digits than its factorization.

81228938811072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391690 (or 391680 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 60.

The spelling of 81228938811072 in words is "eighty-one trillion, two hundred twenty-eight billion, nine hundred thirty-eight million, eight hundred eleven thousand, seventy-two".