686561007 has 32 divisors (see below), whose sum is σ = 1024865280. Its totient is φ = 405256320.

The previous prime is 686561003. The next prime is 686561009. The reversal of 686561007 is 700165686.

It is not a de Polignac number, because 686561007 - 2² = 686561003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686561003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354213 + ... + 356145.

It is an arithmetic number, because the mean of its divisors is an integer number (32027040).

Almost surely, 2^686561007 is an apocalyptic number.

686561007 is a deficient number, since it is larger than the sum of its proper divisors (338304273).

686561007 is a wasteful number, since it uses less digits than its factorization.

686561007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 686561007 is about 26202.3091921304. The cubic root of 686561007 is about 882.1850859253.

The spelling of 686561007 in words is "six hundred eighty-six million, five hundred sixty-one thousand, seven".