81103248 has 160 divisors (see below), whose sum is σ = 252067200. Its totient is φ = 24883200.

The previous prime is 81103213. The next prime is 81103249. The reversal of 81103248 is 84230118.

It is a super-2 number, since 2×81103248² = 13155473672299008, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81103249) 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 31 ways as a sum of consecutive naturals, for example, 336408 + ... + 336648.

It is an arithmetic number, because the mean of its divisors is an integer number (1575420).

Almost surely, 2^81103248 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 81103248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126033600).

81103248 is an abundant number, since it is smaller than the sum of its proper divisors (170963952).

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

81103248 is a wasteful number, since it uses less digits than its factorization.

81103248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81103248 is about 9005.7341732920. The cubic root of 81103248 is about 432.8586317817.

The spelling of 81103248 in words is "eighty-one million, one hundred three thousand, two hundred forty-eight".