81738503988 has 96 divisors (see below), whose sum is σ = 193977907200. Its totient is φ = 26786173824.

The previous prime is 81738503983. The next prime is 81738504037. The reversal of 81738503988 is 88930583718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81738503983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162501745 + ... + 162502247.

It is an arithmetic number, because the mean of its divisors is an integer number (2020603200).

Almost surely, 2^81738503988 is an apocalyptic number.

It is an amenable number.

81738503988 is an abundant number, since it is smaller than the sum of its proper divisors (112239403212).

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

81738503988 is a wasteful number, since it uses less digits than its factorization.

81738503988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 81738503988 in words is "eighty-one billion, seven hundred thirty-eight million, five hundred three thousand, nine hundred eighty-eight".