81712958 has 8 divisors (see below), whose sum is σ = 129020520. Its totient is φ = 38706120.

The previous prime is 81712937. The next prime is 81712991. The reversal of 81712958 is 85921718.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075133 + ... + 1075208.

It is an arithmetic number, because the mean of its divisors is an integer number (16127565).

Almost surely, 2^81712958 is an apocalyptic number.

81712958 is a deficient number, since it is larger than the sum of its proper divisors (47307562).

81712958 is a wasteful number, since it uses less digits than its factorization.

81712958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150362.

The product of its digits is 40320, while the sum is 41.

The square root of 81712958 is about 9039.5220006370. The cubic root of 81712958 is about 433.9406255712.

The spelling of 81712958 in words is "eighty-one million, seven hundred twelve thousand, nine hundred fifty-eight".