81872342 has 16 divisors (see below), whose sum is σ = 127256832. Its totient is φ = 39473280.

The previous prime is 81872339. The next prime is 81872359. The reversal of 81872342 is 24327818.

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 in 7 ways as a sum of consecutive naturals, for example, 3467 + ... + 13257.

It is an arithmetic number, because the mean of its divisors is an integer number (7953552).

Almost surely, 2^81872342 is an apocalyptic number.

81872342 is a deficient number, since it is larger than the sum of its proper divisors (45384490).

81872342 is a wasteful number, since it uses less digits than its factorization.

81872342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9943.

The product of its digits is 21504, while the sum is 35.

The square root of 81872342 is about 9048.3336587462. Note that the first 3 decimals coincide. The cubic root of 81872342 is about 434.2225811492. Note that the first 3 decimals are identical.

The spelling of 81872342 in words is "eighty-one million, eight hundred seventy-two thousand, three hundred forty-two".