686716 has 6 divisors (see below), whose sum is σ = 1201760. Its totient is φ = 343356.

The previous prime is 686687. The next prime is 686723. The reversal of 686716 is 617686.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85836 + ... + 85843.

2⁶⁸⁶⁷¹⁶ is an apocalyptic number.

It is an amenable number.

686716 is a deficient number, since it is larger than the sum of its proper divisors (515044).

686716 is a wasteful number, since it uses less digits than its factorization.

686716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171683 (or 171681 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 686716 is about 828.6832929413. The cubic root of 686716 is about 88.2251466152.

The spelling of 686716 in words is "six hundred eighty-six thousand, seven hundred sixteen".