81230303988 has 18 divisors (see below), whose sum is σ = 205332157394. Its totient is φ = 27076767984.

The previous prime is 81230303971. The next prime is 81230304013. The reversal of 81230303988 is 88930303218.

It can be written as a sum of positive squares in only one way, i.e., 44866865124 + 36363438864 = 211818^2 + 190692^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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, 1128198631 + ... + 1128198702.

Almost surely, 2^81230303988 is an apocalyptic number.

It is an amenable number.

81230303988 is an abundant number, since it is smaller than the sum of its proper divisors (124101853406).

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

81230303988 is a wasteful number, since it uses less digits than its factorization.

81230303988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256397343 (or 2256397338 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 81230303988 in words is "eighty-one billion, two hundred thirty million, three hundred three thousand, nine hundred eighty-eight".