81702843 has 8 divisors (see below), whose sum is σ = 109041168. Its totient is φ = 54416544.

The previous prime is 81702821. The next prime is 81702893. The reversal of 81702843 is 34820718.

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

It is not a de Polignac number, because 81702843 - 2⁵ = 81702811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81702893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9180 + ... + 15737.

It is an arithmetic number, because the mean of its divisors is an integer number (13630146).

Almost surely, 2^81702843 is an apocalyptic number.

81702843 is a deficient number, since it is larger than the sum of its proper divisors (27338325).

81702843 is a wasteful number, since it uses less digits than its factorization.

81702843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26013.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 81702843 is about 9038.9624957735. The cubic root of 81702843 is about 433.9227194330.

The spelling of 81702843 in words is "eighty-one million, seven hundred two thousand, eight hundred forty-three".