81212060 has 24 divisors (see below), whose sum is σ = 180578160. Its totient is φ = 30573824.

The previous prime is 81212041. The next prime is 81212063. The reversal of 81212060 is 6021218.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81212063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119090 + ... + 119769.

It is an arithmetic number, because the mean of its divisors is an integer number (7524090).

Almost surely, 2^81212060 is an apocalyptic number.

It is an amenable number.

81212060 is an abundant number, since it is smaller than the sum of its proper divisors (99366100).

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

81212060 is a wasteful number, since it uses less digits than its factorization.

81212060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238885 (or 238883 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81212060 is about 9011.7734103782. The cubic root of 81212060 is about 433.0521265607.

Adding to 81212060 its reverse (6021218), we get a palindrome (87233278).

The spelling of 81212060 in words is "eighty-one million, two hundred twelve thousand, sixty".