81326080 has 156 divisors (see below), whose sum is σ = 224695512. Its totient is φ = 28016640.

The previous prime is 81326059. The next prime is 81326107. The reversal of 81326080 is 8062318.

It is a super-2 number, since 2×81326080² = 13227862576332800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4280311 + ... + 4280329.

Almost surely, 2^81326080 is an apocalyptic number.

81326080 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 81326080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112347756).

81326080 is an abundant number, since it is smaller than the sum of its proper divisors (143369432).

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

81326080 is a wasteful number, since it uses less digits than its factorization.

81326080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81326080 is about 9018.0973603083. The cubic root of 81326080 is about 433.2546971050.

Adding to 81326080 its reverse (8062318), we get a palindrome (89388398).

The spelling of 81326080 in words is "eighty-one million, three hundred twenty-six thousand, eighty".