81119808 has 336 divisors, whose sum is σ = 304312320. Its totient is φ = 20044800.

The previous prime is 81119789. The next prime is 81119821. The reversal of 81119808 is 80891118.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1374883 + ... + 1374941.

Almost surely, 2^81119808 is an apocalyptic number.

81119808 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81119808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152156160).

81119808 is an abundant number, since it is smaller than the sum of its proper divisors (223192512).

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

81119808 is a wasteful number, since it uses less digits than its factorization.

81119808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 81119808 is about 9006.6535405777. The cubic root of 81119808 is about 432.8880907380. Note that the first 3 decimals are identical.

The spelling of 81119808 in words is "eighty-one million, one hundred nineteen thousand, eight hundred eight".