81342232 has 8 divisors (see below), whose sum is σ = 152516700. Its totient is φ = 40671112.

The previous prime is 81342181. The next prime is 81342253. The reversal of 81342232 is 23224318.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81342197 and 81342206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5083882 + ... + 5083897.

Almost surely, 2^81342232 is an apocalyptic number.

It is an amenable number.

81342232 is a deficient number, since it is larger than the sum of its proper divisors (71174468).

81342232 is a wasteful number, since it uses less digits than its factorization.

81342232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10167785 (or 10167781 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 81342232 is about 9018.9928484283. The cubic root of 81342232 is about 433.2833778047.

The spelling of 81342232 in words is "eighty-one million, three hundred forty-two thousand, two hundred thirty-two".