81327150 has 72 divisors (see below), whose sum is σ = 231373584. Its totient is φ = 20409600.

The previous prime is 81327143. The next prime is 81327151. The reversal of 81327150 is 5172318.

It is a super-2 number, since 2×81327150² = 13228210654245000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81327151) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2335 + ... + 12965.

It is an arithmetic number, because the mean of its divisors is an integer number (3213522).

Almost surely, 2^81327150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81327150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115686792).

81327150 is an abundant number, since it is smaller than the sum of its proper divisors (150046434).

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

81327150 is a wasteful number, since it uses less digits than its factorization.

81327150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10666 (or 10658 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81327150 is about 9018.1566852656. The cubic root of 81327150 is about 433.2565971945.

Adding to 81327150 its reverse (5172318), we get a palindrome (86499468).

The spelling of 81327150 in words is "eighty-one million, three hundred twenty-seven thousand, one hundred fifty".