81237888 has 96 divisors (see below), whose sum is σ = 236505360. Its totient is φ = 26763264.

The previous prime is 81237869. The next prime is 81237889. The reversal of 81237888 is 88873218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81237889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111381 + ... + 112107.

Almost surely, 2^81237888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81237888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118252680).

81237888 is an abundant number, since it is smaller than the sum of its proper divisors (155267472).

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

81237888 is a wasteful number, since it uses less digits than its factorization.

81237888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 829 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 81237888 is about 9013.2063107420. The cubic root of 81237888 is about 433.0980297793.

The spelling of 81237888 in words is "eighty-one million, two hundred thirty-seven thousand, eight hundred eighty-eight".