81708093 has 12 divisors (see below), whose sum is σ = 118129440. Its totient is φ = 54422856.

The previous prime is 81708079. The next prime is 81708119. The reversal of 81708093 is 39080718.

It is not a de Polignac number, because 81708093 - 2¹² = 81703997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81701093) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8430 + ... + 15312.

It is an arithmetic number, because the mean of its divisors is an integer number (9844120).

Almost surely, 2^81708093 is an apocalyptic number.

It is an amenable number.

81708093 is a deficient number, since it is larger than the sum of its proper divisors (36421347).

81708093 is a wasteful number, since it uses less digits than its factorization.

81708093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8208 (or 8205 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 81708093 is about 9039.2529005444. The cubic root of 81708093 is about 433.9320134608.

The spelling of 81708093 in words is "eighty-one million, seven hundred eight thousand, ninety-three".