81212982 has 16 divisors (see below), whose sum is σ = 166203840. Its totient is φ = 26441352.

The previous prime is 81212981. The next prime is 81212993. The reversal of 81212982 is 28921218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81212981) 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, 157132 + ... + 157647.

It is an arithmetic number, because the mean of its divisors is an integer number (10387740).

Almost surely, 2^81212982 is an apocalyptic number.

81212982 is an abundant number, since it is smaller than the sum of its proper divisors (84990858).

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

81212982 is a wasteful number, since it uses less digits than its factorization.

81212982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314827.

The product of its digits is 4608, while the sum is 33.

The square root of 81212982 is about 9011.8245655361. The cubic root of 81212982 is about 433.0537653672.

The spelling of 81212982 in words is "eighty-one million, two hundred twelve thousand, nine hundred eighty-two".