81360378 has 48 divisors (see below), whose sum is σ = 195208416. Its totient is φ = 24282720.

The previous prime is 81360287. The next prime is 81360379. The reversal of 81360378 is 87306318.

It is a super-2 number, since 2×81360378² = 13239022216605768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81360379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10200 + ... + 16332.

It is an arithmetic number, because the mean of its divisors is an integer number (4066842).

Almost surely, 2^81360378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81360378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97604208).

81360378 is an abundant number, since it is smaller than the sum of its proper divisors (113848038).

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

81360378 is a wasteful number, since it uses less digits than its factorization.

81360378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6219 (or 6216 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81360378 is about 9019.9987804877. The cubic root of 81360378 is about 433.3155946716.

The spelling of 81360378 in words is "eighty-one million, three hundred sixty thousand, three hundred seventy-eight".