81150340 has 24 divisors (see below), whose sum is σ = 170697240. Its totient is φ = 32406528.

The previous prime is 81150337. The next prime is 81150347. The reversal of 81150340 is 4305118.

81150340 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 18455616 + 62694724 = 4296^2 + 7918^2 .

81150340 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (81150347) 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, 10446 + ... + 16474.

It is an arithmetic number, because the mean of its divisors is an integer number (7112385).

Almost surely, 2^81150340 is an apocalyptic number.

It is an amenable number.

81150340 is an abundant number, since it is smaller than the sum of its proper divisors (89546900).

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

81150340 is a wasteful number, since it uses less digits than its factorization.

81150340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711 (or 6709 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81150340 is about 9008.3483502804. The cubic root of 81150340 is about 432.9423942908.

Adding to 81150340 its reverse (4305118), we get a palindrome (85455458).

The spelling of 81150340 in words is "eighty-one million, one hundred fifty thousand, three hundred forty".