87721013686512 has 80 divisors (see below), whose sum is σ = 227054494546560. Its totient is φ = 29183339686656.

The previous prime is 87721013686457. The next prime is 87721013686547. The reversal of 87721013686512 is 21568631012778.

It is a super-3 number, since 3×87721013686512³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157190314 + ... + 157747382.

It is an arithmetic number, because the mean of its divisors is an integer number (2838181181832).

Almost surely, 2^{87721013686512} is an apocalyptic number.

It is an amenable number.

87721013686512 is an abundant number, since it is smaller than the sum of its proper divisors (139333480860048).

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

87721013686512 is a wasteful number, since it uses less digits than its factorization.

87721013686512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563470 (or 563464 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 87721013686512 in words is "eighty-seven trillion, seven hundred twenty-one billion, thirteen million, six hundred eighty-six thousand, five hundred twelve".