81702018 has 24 divisors (see below), whose sum is σ = 178051068. Its totient is φ = 27075552.

The previous prime is 81702013. The next prime is 81702029. The reversal of 81702018 is 81020718.

It can be written as a sum of positive squares in 2 ways, for example, as 81595089 + 106929 = 9033^2 + 327^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81701982 and 81702000.

It is not an unprimeable number, because it can be changed into a prime (81702013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10005 + ... + 16232.

Almost surely, 2^81702018 is an apocalyptic number.

81702018 is an abundant number, since it is smaller than the sum of its proper divisors (96349050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81702018 is a wasteful number, since it uses less digits than its factorization.

81702018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26418 (or 26415 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 81702018 is about 9038.9168598898. The cubic root of 81702018 is about 433.9212589067.

The spelling of 81702018 in words is "eighty-one million, seven hundred two thousand, eighteen".