81360160 has 48 divisors (see below), whose sum is σ = 219675456. Its totient is φ = 27894528.

The previous prime is 81360127. The next prime is 81360161. The reversal of 81360160 is 6106318.

It is not an unprimeable number, because it can be changed into a prime (81360161) 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, 35202 + ... + 37441.

It is an arithmetic number, because the mean of its divisors is an integer number (4576572).

Almost surely, 2^81360160 is an apocalyptic number.

81360160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81360160 is an abundant number, since it is smaller than the sum of its proper divisors (138315296).

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

81360160 is a wasteful number, since it uses less digits than its factorization.

81360160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72665 (or 72657 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81360160 is about 9019.9866962208. The cubic root of 81360160 is about 433.3152076574.

Adding to 81360160 its reverse (6106318), we get a palindrome (87466478).

The spelling of 81360160 in words is "eighty-one million, three hundred sixty thousand, one hundred sixty".