81423111288 has 32 divisors (see below), whose sum is σ = 203598604800. Its totient is φ = 27135593568.

The previous prime is 81423111257. The next prime is 81423111313. The reversal of 81423111288 is 88211132418.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217158 + ... + 458261.

It is an arithmetic number, because the mean of its divisors is an integer number (6362456400).

Almost surely, 2^81423111288 is an apocalyptic number.

It is an amenable number.

81423111288 is an abundant number, since it is smaller than the sum of its proper divisors (122175493512).

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

81423111288 is a wasteful number, since it uses less digits than its factorization.

81423111288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680451 (or 680447 counting only the distinct ones).

The product of its digits is 24576, while the sum is 39.

The spelling of 81423111288 in words is "eighty-one billion, four hundred twenty-three million, one hundred eleven thousand, two hundred eighty-eight".