81327260 has 72 divisors (see below), whose sum is σ = 205156224. Its totient is φ = 26974080.

The previous prime is 81327251. The next prime is 81327271. The reversal of 81327260 is 6272318.

It is a happy number.

It is a super-2 number, since 2×81327260² = 13228246438215200, which contains 22 as substring.

It is a congruent number.

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, 29042 + ... + 31718.

It is an arithmetic number, because the mean of its divisors is an integer number (2849392).

Almost surely, 2^81327260 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 81327260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102578112).

81327260 is an abundant number, since it is smaller than the sum of its proper divisors (123828964).

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

81327260 is a wasteful number, since it uses less digits than its factorization.

81327260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 81327260 is about 9018.1627840708. The cubic root of 81327260 is about 433.2567925298.

Adding to 81327260 its reverse (6272318), we get a palindrome (87599578).

The spelling of 81327260 in words is "eighty-one million, three hundred twenty-seven thousand, two hundred sixty".