686628789 has 16 divisors (see below), whose sum is σ = 1141409280. Its totient is φ = 356690160.

The previous prime is 686628751. The next prime is 686628841. The reversal of 686628789 is 987826686.

It is not a de Polignac number, because 686628789 - 2⁷ = 686628661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686628739) 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, 1485979 + ... + 1486440.

It is an arithmetic number, because the mean of its divisors is an integer number (71338080).

Almost surely, 2^686628789 is an apocalyptic number.

It is an amenable number.

686628789 is a deficient number, since it is larger than the sum of its proper divisors (454780491).

686628789 is a wasteful number, since it uses less digits than its factorization.

686628789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972440.

The product of its digits is 13934592, while the sum is 60.

The square root of 686628789 is about 26203.6025958264. The cubic root of 686628789 is about 882.2141167525.

The spelling of 686628789 in words is "six hundred eighty-six million, six hundred twenty-eight thousand, seven hundred eighty-nine".