686905550 has 12 divisors (see below), whose sum is σ = 1277644416. Its totient is φ = 274762200.

The previous prime is 686905523. The next prime is 686905559. The reversal of 686905550 is 55509686.

686905550 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 (686905559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6869006 + ... + 6869105.

It is an arithmetic number, because the mean of its divisors is an integer number (106470368).

Almost surely, 2^686905550 is an apocalyptic number.

686905550 is a deficient number, since it is larger than the sum of its proper divisors (590738866).

686905550 is a wasteful number, since it uses less digits than its factorization.

686905550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13738123 (or 13738118 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 44.

The square root of 686905550 is about 26208.8830361006. The cubic root of 686905550 is about 882.3326328354.

The spelling of 686905550 in words is "six hundred eighty-six million, nine hundred five thousand, five hundred fifty".