81280680 has 64 divisors (see below), whose sum is σ = 262604160. Its totient is φ = 20007168.

The previous prime is 81280607. The next prime is 81280681. The reversal of 81280680 is 8608218.

It is not an unprimeable number, because it can be changed into a prime (81280681) 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 15 ways as a sum of consecutive naturals, for example, 24492 + ... + 27611.

It is an arithmetic number, because the mean of its divisors is an integer number (4103190).

Almost surely, 2^81280680 is an apocalyptic number.

It is an amenable number.

81280680 is an abundant number, since it is smaller than the sum of its proper divisors (181323480).

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

81280680 is a wasteful number, since it uses less digits than its factorization.

81280680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52130 (or 52126 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 81280680 is about 9015.5798482405. The cubic root of 81280680 is about 433.1740611246.

Adding to 81280680 its reverse (8608218), we get a palindrome (89888898).

The spelling of 81280680 in words is "eighty-one million, two hundred eighty thousand, six hundred eighty".