686928669 has 16 divisors (see below), whose sum is σ = 1047121920. Its totient is φ = 392390640.

The previous prime is 686928653. The next prime is 686928677. The reversal of 686928669 is 966829686.

It is not a de Polignac number, because 686928669 - 2⁴ = 686928653 is a prime.

It is a super-2 number, since 2×686928669² = 943741992588223122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686928629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94764 + ... + 101754.

It is an arithmetic number, because the mean of its divisors is an integer number (65445120).

Almost surely, 2^686928669 is an apocalyptic number.

It is an amenable number.

686928669 is a deficient number, since it is larger than the sum of its proper divisors (360193251).

686928669 is a wasteful number, since it uses less digits than its factorization.

686928669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11680.

The product of its digits is 13436928, while the sum is 60.

The square root of 686928669 is about 26209.3240851419. The cubic root of 686928669 is about 882.3425315371.

The spelling of 686928669 in words is "six hundred eighty-six million, nine hundred twenty-eight thousand, six hundred sixty-nine".