81212862 has 32 divisors (see below), whose sum is σ = 171263232. Its totient is φ = 25622784.

The previous prime is 81212819. The next prime is 81212863. The reversal of 81212862 is 26821218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81212863) by changing a digit.

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, 10353 + ... + 16419.

It is an arithmetic number, because the mean of its divisors is an integer number (5351976).

Almost surely, 2^81212862 is an apocalyptic number.

81212862 is an abundant number, since it is smaller than the sum of its proper divisors (90050370).

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

81212862 is a wasteful number, since it uses less digits than its factorization.

81212862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6192.

The product of its digits is 3072, while the sum is 30.

The square root of 81212862 is about 9011.8179076144. The cubic root of 81212862 is about 433.0535520742.

The spelling of 81212862 in words is "eighty-one million, two hundred twelve thousand, eight hundred sixty-two".