81087848033872 has 30 divisors (see below), whose sum is σ = 158114766153678. Its totient is φ = 40285682266752.

The previous prime is 81087848033837. The next prime is 81087848033891. The reversal of 81087848033872 is 27833084878018.

It can be written as a sum of positive squares in 3 ways, for example, as 5421092648976 + 75666755384896 = 2328324^2 + 8698664^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81087848033798 and 81087848033807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102408783 + ... + 103197550.

Almost surely, 2^{81087848033872} is an apocalyptic number.

It is an amenable number.

81087848033872 is a deficient number, since it is larger than the sum of its proper divisors (77026918119806).

81087848033872 is a wasteful number, since it uses less digits than its factorization.

81087848033872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205606655 (or 205606492 counting only the distinct ones).

The product of its (nonzero) digits is 115605504, while the sum is 67.

The spelling of 81087848033872 in words is "eighty-one trillion, eighty-seven billion, eight hundred forty-eight million, thirty-three thousand, eight hundred seventy-two".