686867838 has 16 divisors (see below), whose sum is σ = 1375784976. Its totient is φ = 228614400.

The previous prime is 686867821. The next prime is 686867843. The reversal of 686867838 is 838768686.

It is a congruent number.

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, 81013 + ... + 89088.

It is an arithmetic number, because the mean of its divisors is an integer number (85986561).

Almost surely, 2^686867838 is an apocalyptic number.

686867838 is an abundant number, since it is smaller than the sum of its proper divisors (688917138).

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

686867838 is a wasteful number, since it uses less digits than its factorization.

686867838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170779.

The product of its digits is 18579456, while the sum is 60.

The square root of 686867838 is about 26208.1635754969. The cubic root of 686867838 is about 882.3164854737.

The spelling of 686867838 in words is "six hundred eighty-six million, eight hundred sixty-seven thousand, eight hundred thirty-eight".