81132480 has 336 divisors, whose sum is σ = 329513184. Its totient is φ = 18063360.

The previous prime is 81132479. The next prime is 81132503. The reversal of 81132480 is 8423118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 411742 + ... + 411938.

It is an arithmetic number, because the mean of its divisors is an integer number (980694).

Almost surely, 2^81132480 is an apocalyptic number.

81132480 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 81132480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164756592).

81132480 is an abundant number, since it is smaller than the sum of its proper divisors (248380704).

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

81132480 is a wasteful number, since it uses less digits than its factorization.

81132480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 231 counting only the distinct ones).

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

The square root of 81132480 is about 9007.3569930363. The cubic root of 81132480 is about 432.9106305361.

Adding to 81132480 its reverse (8423118), we get a palindrome (89555598).

The spelling of 81132480 in words is "eighty-one million, one hundred thirty-two thousand, four hundred eighty".