81342374 has 8 divisors (see below), whose sum is σ = 122115000. Its totient is φ = 40637376.

The previous prime is 81342337. The next prime is 81342377. The reversal of 81342374 is 47324318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81342374.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81342377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13784 + ... + 18779.

It is an arithmetic number, because the mean of its divisors is an integer number (15264375).

Almost surely, 2^81342374 is an apocalyptic number.

81342374 is a deficient number, since it is larger than the sum of its proper divisors (40772626).

81342374 is a wasteful number, since it uses less digits than its factorization.

81342374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33814.

The product of its digits is 16128, while the sum is 32.

The square root of 81342374 is about 9019.0007207007. Note that the first 3 decimals coincide. The cubic root of 81342374 is about 433.2836299337.

The spelling of 81342374 in words is "eighty-one million, three hundred forty-two thousand, three hundred seventy-four".