81282812 has 12 divisors (see below), whose sum is σ = 153186936. Its totient is φ = 37515120.

The previous prime is 81282809. The next prime is 81282823. The reversal of 81282812 is 21828218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781514 + ... + 781617.

It is an arithmetic number, because the mean of its divisors is an integer number (12765578).

Almost surely, 2^81282812 is an apocalyptic number.

It is an amenable number.

81282812 is a deficient number, since it is larger than the sum of its proper divisors (71904124).

81282812 is a wasteful number, since it uses less digits than its factorization.

81282812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563148 (or 1563146 counting only the distinct ones).

The product of its digits is 4096, while the sum is 32.

The square root of 81282812 is about 9015.6980872254. The cubic root of 81282812 is about 433.1778484905.

The spelling of 81282812 in words is "eighty-one million, two hundred eighty-two thousand, eight hundred twelve".