81723358 has 8 divisors (see below), whose sum is σ = 122939352. Its totient is φ = 40743576.

The previous prime is 81723331. The next prime is 81723359. The reversal of 81723358 is 85332718.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81723359) 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, 58185 + ... + 59572.

It is an arithmetic number, because the mean of its divisors is an integer number (15367419).

Almost surely, 2^81723358 is an apocalyptic number.

81723358 is a deficient number, since it is larger than the sum of its proper divisors (41215994).

81723358 is a wasteful number, since it uses less digits than its factorization.

81723358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118106.

The product of its digits is 40320, while the sum is 37.

The square root of 81723358 is about 9040.0972339904. The cubic root of 81723358 is about 433.9590346916.

The spelling of 81723358 in words is "eighty-one million, seven hundred twenty-three thousand, three hundred fifty-eight".