81357873 has 8 divisors (see below), whose sum is σ = 110316000. Its totient is φ = 53319168.

The previous prime is 81357841. The next prime is 81357883. The reversal of 81357873 is 37875318.

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

It is not a de Polignac number, because 81357873 - 2⁵ = 81357841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81357883) by changing a digit.

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, 229648 + ... + 230001.

It is an arithmetic number, because the mean of its divisors is an integer number (13789500).

Almost surely, 2^81357873 is an apocalyptic number.

It is an amenable number.

81357873 is a deficient number, since it is larger than the sum of its proper divisors (28958127).

81357873 is a wasteful number, since it uses less digits than its factorization.

81357873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459711.

The product of its digits is 141120, while the sum is 42.

The square root of 81357873 is about 9019.8599213070. The cubic root of 81357873 is about 433.3111475164.

The spelling of 81357873 in words is "eighty-one million, three hundred fifty-seven thousand, eight hundred seventy-three".