81103056 has 40 divisors (see below), whose sum is σ = 221842944. Its totient is φ = 25443840.

The previous prime is 81103051. The next prime is 81103069. The reversal of 81103056 is 65030118.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81103051) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 48880 + ... + 50511.

Almost surely, 2^81103056 is an apocalyptic number.

It is an amenable number.

81103056 is an abundant number, since it is smaller than the sum of its proper divisors (140739888).

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

81103056 is a wasteful number, since it uses less digits than its factorization.

81103056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99419 (or 99413 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 81103056 is about 9005.7235134108. The cubic root of 81103056 is about 432.8582902050.

The spelling of 81103056 in words is "eighty-one million, one hundred three thousand, fifty-six".