686842278 has 16 divisors (see below), whose sum is σ = 1374288240. Its totient is φ = 228846816.

The previous prime is 686842223. The next prime is 686842297. The reversal of 686842278 is 872248686.

It is a self number, because there is not a number n which added to its sum of digits gives 686842278.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9625 + ... + 38292.

It is an arithmetic number, because the mean of its divisors is an integer number (85893015).

Almost surely, 2^686842278 is an apocalyptic number.

686842278 is an abundant number, since it is smaller than the sum of its proper divisors (687445962).

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

686842278 is a wasteful number, since it uses less digits than its factorization.

686842278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50311.

The product of its digits is 2064384, while the sum is 51.

The square root of 686842278 is about 26207.6759366412. The cubic root of 686842278 is about 882.3055409669.

The spelling of 686842278 in words is "six hundred eighty-six million, eight hundred forty-two thousand, two hundred seventy-eight".