81103488 has 64 divisors (see below), whose sum is σ = 222890400. Its totient is φ = 26098688.

The previous prime is 81103483. The next prime is 81103507. The reversal of 81103488 is 88430118.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×81103488² = 13155551531532288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81103483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7495 + ... + 14777.

Almost surely, 2^81103488 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 81103488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111445200).

81103488 is an abundant number, since it is smaller than the sum of its proper divisors (141786912).

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

81103488 is a wasteful number, since it uses less digits than its factorization.

81103488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7329 (or 7317 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81103488 is about 9005.7474981258. The cubic root of 81103488 is about 432.8590587517.

The spelling of 81103488 in words is "eighty-one million, one hundred three thousand, four hundred eighty-eight".