81360126 has 40 divisors (see below), whose sum is σ = 183082680. Its totient is φ = 27004752.

The previous prime is 81360121. The next prime is 81360127. The reversal of 81360126 is 62106318.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81360126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81360121) 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 19 ways as a sum of consecutive naturals, for example, 42645 + ... + 44511.

It is an arithmetic number, because the mean of its divisors is an integer number (4577067).

Almost surely, 2^81360126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81360126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91541340).

81360126 is an abundant number, since it is smaller than the sum of its proper divisors (101722554).

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

81360126 is a wasteful number, since it uses less digits than its factorization.

81360126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2141 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81360126 is about 9019.9848115171. The cubic root of 81360126 is about 433.3151472973.

The spelling of 81360126 in words is "eighty-one million, three hundred sixty thousand, one hundred twenty-six".