81110340 has 72 divisors (see below), whose sum is σ = 246781080. Its totient is φ = 21563904.

The previous prime is 81110317. The next prime is 81110357. The reversal of 81110340 is 4301118.

It can be written as a sum of positive squares in 4 ways, for example, as 6874884 + 74235456 = 2622^2 + 8616^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99856 + ... + 100664.

It is an arithmetic number, because the mean of its divisors is an integer number (3427515).

Almost surely, 2^81110340 is an apocalyptic number.

It is an amenable number.

81110340 is an abundant number, since it is smaller than the sum of its proper divisors (165670740).

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

81110340 is a wasteful number, since it uses less digits than its factorization.

81110340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381 (or 1376 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 81110340 is about 9006.1279138151. The cubic root of 81110340 is about 432.8712483908.

Adding to 81110340 its reverse (4301118), we get a palindrome (85411458).

The spelling of 81110340 in words is "eighty-one million, one hundred ten thousand, three hundred forty".