81680060 has 72 divisors (see below), whose sum is σ = 217700784. Its totient is φ = 25455360.

The previous prime is 81680059. The next prime is 81680083. The reversal of 81680060 is 6008618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6992 + ... + 14568.

It is an arithmetic number, because the mean of its divisors is an integer number (3023622).

Almost surely, 2^81680060 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 81680060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108850392).

81680060 is an abundant number, since it is smaller than the sum of its proper divisors (136020724).

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

81680060 is a wasteful number, since it uses less digits than its factorization.

81680060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7611 (or 7602 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 81680060 is about 9037.7021415844. The cubic root of 81680060 is about 433.8823822794.

Adding to 81680060 its reverse (6008618), we get a palindrome (87688678).

The spelling of 81680060 in words is "eighty-one million, six hundred eighty thousand, sixty".