81342012 has 24 divisors (see below), whose sum is σ = 189974736. Its totient is φ = 27088768.

The previous prime is 81342011. The next prime is 81342031. The reversal of 81342012 is 21024318.

It is a self number, because there is not a number n which added to its sum of digits gives 81342012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342011) 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, 14008 + ... + 18944.

It is an arithmetic number, because the mean of its divisors is an integer number (7915614).

Almost surely, 2^81342012 is an apocalyptic number.

It is an amenable number.

81342012 is an abundant number, since it is smaller than the sum of its proper divisors (108632724).

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

81342012 is a wasteful number, since it uses less digits than its factorization.

81342012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6317 (or 6315 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81342012 is about 9018.9806519362. The cubic root of 81342012 is about 433.2829871817.

The spelling of 81342012 in words is "eighty-one million, three hundred forty-two thousand, twelve".