686623838 has 8 divisors (see below), whose sum is σ = 1044044688. Its totient is φ = 338608944.

The previous prime is 686623801. The next prime is 686623841. The reversal of 686623838 is 838326686.

686623838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2351306 + ... + 2351597.

It is an arithmetic number, because the mean of its divisors is an integer number (130505586).

Almost surely, 2^686623838 is an apocalyptic number.

686623838 is a deficient number, since it is larger than the sum of its proper divisors (357420850).

686623838 is a wasteful number, since it uses less digits than its factorization.

686623838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702978.

The product of its digits is 1990656, while the sum is 50.

The square root of 686623838 is about 26203.5081239135. The cubic root of 686623838 is about 882.2119963187.

The spelling of 686623838 in words is "six hundred eighty-six million, six hundred twenty-three thousand, eight hundred thirty-eight".