81332260 has 12 divisors (see below), whose sum is σ = 170797788. Its totient is φ = 32532896.

The previous prime is 81332257. The next prime is 81332297. The reversal of 81332260 is 6223318.

It can be written as a sum of positive squares in 2 ways, for example, as 40653376 + 40678884 = 6376^2 + 6378^2 .

It is a super-2 number, since 2×81332260² = 13229873033415200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033287 + ... + 2033326.

It is an arithmetic number, because the mean of its divisors is an integer number (14233149).

Almost surely, 2^81332260 is an apocalyptic number.

It is an amenable number.

81332260 is an abundant number, since it is smaller than the sum of its proper divisors (89465528).

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

81332260 is a wasteful number, since it uses less digits than its factorization.

81332260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066622 (or 4066620 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 81332260 is about 9018.4399981372. The cubic root of 81332260 is about 433.2656712239.

Adding to 81332260 its reverse (6223318), we get a palindrome (87555578).

The spelling of 81332260 in words is "eighty-one million, three hundred thirty-two thousand, two hundred sixty".