81688837000 has 64 divisors (see below), whose sum is σ = 193844327040. Its totient is φ = 32215288000.

The previous prime is 81688836997. The next prime is 81688837037. The reversal of 81688837000 is 73888618.

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, 504274 + ... + 646273.

It is an arithmetic number, because the mean of its divisors is an integer number (3028817610).

Almost surely, 2^81688837000 is an apocalyptic number.

It is an amenable number.

81688837000 is an abundant number, since it is smaller than the sum of its proper divisors (112155490040).

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

81688837000 is a wasteful number, since it uses less digits than its factorization.

81688837000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150639 (or 1150625 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

The spelling of 81688837000 in words is "eighty-one billion, six hundred eighty-eight million, eight hundred thirty-seven thousand".