686490071 has 4 divisors (see below), whose sum is σ = 708634944. Its totient is φ = 664345200.

The previous prime is 686490053. The next prime is 686490089. The reversal of 686490071 is 170094686.

686490071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (686490053) and next prime (686490089).

It is a cyclic number.

It is not a de Polignac number, because 686490071 - 2²² = 682295767 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 (686490011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11072390 + ... + 11072451.

It is an arithmetic number, because the mean of its divisors is an integer number (177158736).

Almost surely, 2^686490071 is an apocalyptic number.

686490071 is a deficient number, since it is larger than the sum of its proper divisors (22144873).

686490071 is a wasteful number, since it uses less digits than its factorization.

686490071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22144872.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 686490071 is about 26200.9555360105. The cubic root of 686490071 is about 882.1547022032.

The spelling of 686490071 in words is "six hundred eighty-six million, four hundred ninety thousand, seventy-one".