81889673 has 8 divisors (see below), whose sum is σ = 83953056. Its totient is φ = 79833600.

The previous prime is 81889657. The next prime is 81889679. The reversal of 81889673 is 37698818.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81889673 - 2⁴ = 81889657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81889679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26078 + ... + 29048.

It is an arithmetic number, because the mean of its divisors is an integer number (10494132).

Almost surely, 2^81889673 is an apocalyptic number.

It is an amenable number.

81889673 is a deficient number, since it is larger than the sum of its proper divisors (2063383).

81889673 is a wasteful number, since it uses less digits than its factorization.

81889673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655.

The product of its digits is 580608, while the sum is 50.

The square root of 81889673 is about 9049.2912982178. The cubic root of 81889673 is about 434.2532181972.

The spelling of 81889673 in words is "eighty-one million, eight hundred eighty-nine thousand, six hundred seventy-three".