81363360 has 288 divisors, whose sum is σ = 298831680. Its totient is φ = 18530304.

The previous prime is 81363329. The next prime is 81363361. The reversal of 81363360 is 6336318.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (81363361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1379011 + ... + 1379069.

It is an arithmetic number, because the mean of its divisors is an integer number (1037610).

Almost surely, 2^81363360 is an apocalyptic number.

81363360 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81363360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149415840).

81363360 is an abundant number, since it is smaller than the sum of its proper divisors (217468320).

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

81363360 is a wasteful number, since it uses less digits than its factorization.

81363360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 81363360 is about 9020.1640783303. The cubic root of 81363360 is about 433.3208885315.

Adding to 81363360 its reverse (6336318), we get a palindrome (87699678).

The spelling of 81363360 in words is "eighty-one million, three hundred sixty-three thousand, three hundred sixty".