81700718 has 32 divisors (see below), whose sum is σ = 136950912. Its totient is φ = 36244000.

The previous prime is 81700709. The next prime is 81700721.

81700718 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184205 + ... + 184647.

It is an arithmetic number, because the mean of its divisors is an integer number (4279716).

Almost surely, 2^81700718 is an apocalyptic number.

81700718 is a deficient number, since it is larger than the sum of its proper divisors (55250194).

81700718 is a wasteful number, since it uses less digits than its factorization.

81700718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640.

The product of its (nonzero) digits is 3136, while the sum is 32.

The square root of 81700718 is about 9038.8449483327. The cubic root of 81700718 is about 433.9189574514.

The spelling of 81700718 in words is "eighty-one million, seven hundred thousand, seven hundred eighteen".