81103128 has 16 divisors (see below), whose sum is σ = 202757880. Its totient is φ = 27034368.

The previous prime is 81103109. The next prime is 81103133. The reversal of 81103128 is 82130118.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 3379297 = 81103128 / (8 + 1 + 1 + 0 + 3 + 1 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 81103098 and 81103107.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1689625 + ... + 1689672.

Almost surely, 2^81103128 is an apocalyptic number.

It is an amenable number.

81103128 is an abundant number, since it is smaller than the sum of its proper divisors (121654752).

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

81103128 is a wasteful number, since it uses less digits than its factorization.

81103128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379306 (or 3379302 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 81103128 is about 9005.7275108677. The cubic root of 81103128 is about 432.8584182963.

The spelling of 81103128 in words is "eighty-one million, one hundred three thousand, one hundred twenty-eight".