686815338 has 16 divisors (see below), whose sum is σ = 1498506336. Its totient is φ = 208125840.

The previous prime is 686815291. The next prime is 686815343. The reversal of 686815338 is 833518686.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5203081 + ... + 5203212.

It is an arithmetic number, because the mean of its divisors is an integer number (93656646).

Almost surely, 2^686815338 is an apocalyptic number.

686815338 is an abundant number, since it is smaller than the sum of its proper divisors (811690998).

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

686815338 is a wasteful number, since it uses less digits than its factorization.

686815338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10406309.

The product of its digits is 829440, while the sum is 48.

The square root of 686815338 is about 26207.1619600444. The cubic root of 686815338 is about 882.2940052656.

The spelling of 686815338 in words is "six hundred eighty-six million, eight hundred fifteen thousand, three hundred thirty-eight".