686001678 has 16 divisors (see below), whose sum is σ = 1373578320. Its totient is φ = 228404736.

The previous prime is 686001671. The next prime is 686001683. The reversal of 686001678 is 876100686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686001671) 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, 59923 + ... + 70446.

It is an arithmetic number, because the mean of its divisors is an integer number (85848645).

Almost surely, 2^686001678 is an apocalyptic number.

686001678 is an abundant number, since it is smaller than the sum of its proper divisors (687576642).

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

686001678 is a wasteful number, since it uses less digits than its factorization.

686001678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131251.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 686001678 is about 26191.6337405669. The cubic root of 686001678 is about 881.9454540236.

The spelling of 686001678 in words is "six hundred eighty-six million, one thousand, six hundred seventy-eight".