686449998 has 32 divisors (see below), whose sum is σ = 1642788000. Its totient is φ = 211215168.

The previous prime is 686449991. The next prime is 686449999. The reversal of 686449998 is 899944686.

686449998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686449991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488223 + ... + 489626.

It is an arithmetic number, because the mean of its divisors is an integer number (51337125).

Almost surely, 2^686449998 is an apocalyptic number.

686449998 is an abundant number, since it is smaller than the sum of its proper divisors (956338002).

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

686449998 is a wasteful number, since it uses less digits than its factorization.

686449998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977873 (or 977867 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The square root of 686449998 is about 26200.1908008320. The cubic root of 686449998 is about 882.1375369764.

The spelling of 686449998 in words is "six hundred eighty-six million, four hundred forty-nine thousand, nine hundred ninety-eight".