686219670 has 24 divisors (see below), whose sum is σ = 1784171376. Its totient is φ = 182991888.

The previous prime is 686219669. The next prime is 686219687. The reversal of 686219670 is 76912686.

686219670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3812242 + ... + 3812421.

It is an arithmetic number, because the mean of its divisors is an integer number (74340474).

Almost surely, 2^686219670 is an apocalyptic number.

686219670 is an abundant number, since it is smaller than the sum of its proper divisors (1097951706).

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

686219670 is a wasteful number, since it uses less digits than its factorization.

686219670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7624676 (or 7624673 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 686219670 is about 26195.7948915470. The cubic root of 686219670 is about 882.0388632667.

The spelling of 686219670 in words is "six hundred eighty-six million, two hundred nineteen thousand, six hundred seventy".