81226080 has 144 divisors (see below), whose sum is σ = 298574640. Its totient is φ = 19989504.

The previous prime is 81226073. The next prime is 81226081. The reversal of 81226080 is 8062218.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81226081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16551 + ... + 20889.

It is an arithmetic number, because the mean of its divisors is an integer number (2073435).

Almost surely, 2^81226080 is an apocalyptic number.

81226080 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 81226080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149287320).

81226080 is an abundant number, since it is smaller than the sum of its proper divisors (217348560).

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

81226080 is a wasteful number, since it uses less digits than its factorization.

81226080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373 (or 4362 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81226080 is about 9012.5512481206. The cubic root of 81226080 is about 433.0770450333.

Adding to 81226080 its reverse (8062218), we get a palindrome (89288298).

The spelling of 81226080 in words is "eighty-one million, two hundred twenty-six thousand, eighty".