81252060 has 48 divisors (see below), whose sum is σ = 229318656. Its totient is φ = 21494592.

The previous prime is 81252047. The next prime is 81252071. The reversal of 81252060 is 6025218.

It is a self number, because there is not a number n which added to its sum of digits gives 81252060.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2289 + ... + 12951.

It is an arithmetic number, because the mean of its divisors is an integer number (4777472).

Almost surely, 2^81252060 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 81252060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114659328).

81252060 is an abundant number, since it is smaller than the sum of its proper divisors (148066596).

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

81252060 is a wasteful number, since it uses less digits than its factorization.

81252060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802 (or 10800 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 81252060 is about 9013.9924561761. The cubic root of 81252060 is about 433.1232130550.

Adding to 81252060 its reverse (6025218), we get a palindrome (87277278).

The spelling of 81252060 in words is "eighty-one million, two hundred fifty-two thousand, sixty".