686128967 has 8 divisors (see below), whose sum is σ = 689244192. Its totient is φ = 683020800.

The previous prime is 686128957. The next prime is 686128979. The reversal of 686128967 is 769821686.

It is a Cunningham number, because it is equal to 882³-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686128967 - 2¹⁶ = 686063431 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 (686128957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295742 + ... + 298052.

It is an arithmetic number, because the mean of its divisors is an integer number (86155524).

Almost surely, 2^686128967 is an apocalyptic number.

686128967 is a deficient number, since it is larger than the sum of its proper divisors (3115225).

686128967 is a wasteful number, since it uses less digits than its factorization.

686128967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529.

The product of its digits is 1741824, while the sum is 53.

The square root of 686128967 is about 26194.0635831862. The cubic root of 686128967 is about 881.9999995715. Note that the first 6 decimals are identical.

The spelling of 686128967 in words is "six hundred eighty-six million, one hundred twenty-eight thousand, nine hundred sixty-seven".