81060280 has 128 divisors (see below), whose sum is σ = 223534080. Its totient is φ = 25850880.

The previous prime is 81060263. The next prime is 81060299. The reversal of 81060280 is 8206018.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 263887 + ... + 264193.

It is an arithmetic number, because the mean of its divisors is an integer number (1746360).

Almost surely, 2^81060280 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 81060280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111767040).

81060280 is an abundant number, since it is smaller than the sum of its proper divisors (142473800).

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

81060280 is a wasteful number, since it uses less digits than its factorization.

81060280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 81060280 is about 9003.3482660619. The cubic root of 81060280 is about 432.7821763348.

Adding to 81060280 its reverse (8206018), we get a palindrome (89266298).

The spelling of 81060280 in words is "eighty-one million, sixty thousand, two hundred eighty".