1686720071 has 8 divisors (see below), whose sum is σ = 1728488160. Its totient is φ = 1645320352.

The previous prime is 1686720047. The next prime is 1686720097. The reversal of 1686720071 is 1700276861.

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

It is a cyclic number.

It is not a de Polignac number, because 1686720071 - 2¹⁴ = 1686703687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686720001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82811 + ... + 101148.

It is an arithmetic number, because the mean of its divisors is an integer number (216061020).

Almost surely, 2^1686720071 is an apocalyptic number.

1686720071 is a deficient number, since it is larger than the sum of its proper divisors (41768089).

1686720071 is a wasteful number, since it uses less digits than its factorization.

1686720071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184185.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 1686720071 is about 41069.6977222867. The cubic root of 1686720071 is about 1190.3673443984.

The spelling of 1686720071 in words is "one billion, six hundred eighty-six million, seven hundred twenty thousand, seventy-one".