81260340 has 192 divisors, whose sum is σ = 290304000. Its totient is φ = 16533504.

The previous prime is 81260339. The next prime is 81260371. The reversal of 81260340 is 4306218.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81260340.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 135361 + ... + 135959.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^81260340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81260340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145152000).

81260340 is an abundant number, since it is smaller than the sum of its proper divisors (209043660).

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

81260340 is a wasteful number, since it uses less digits than its factorization.

81260340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 81260340 is about 9014.4517304160. The cubic root of 81260340 is about 433.1379250446.

Adding to 81260340 its reverse (4306218), we get a palindrome (85566558).

The spelling of 81260340 in words is "eighty-one million, two hundred sixty thousand, three hundred forty".