686969658 has 24 divisors (see below), whose sum is σ = 1553149728. Its totient is φ = 219033672.

The previous prime is 686969653. The next prime is 686969663. The reversal of 686969658 is 856969686.

686969658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (686969653) and next prime (686969663).

It is a super-2 number, since 2×686969658² = 943854622025273928, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 686969595 and 686969604.

It is not an unprimeable number, because it can be changed into a prime (686969653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 829260 + ... + 830087.

It is an arithmetic number, because the mean of its divisors is an integer number (64714572).

Almost surely, 2^686969658 is an apocalyptic number.

686969658 is an abundant number, since it is smaller than the sum of its proper divisors (866180070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686969658 is a wasteful number, since it uses less digits than its factorization.

686969658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659378 (or 1659375 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The square root of 686969658 is about 26210.1060280190. The cubic root of 686969658 is about 882.3600809665.

The spelling of 686969658 in words is "six hundred eighty-six million, nine hundred sixty-nine thousand, six hundred fifty-eight".