686544806 has 8 divisors (see below), whose sum is σ = 1029974184. Its totient is φ = 343220080.

The previous prime is 686544787. The next prime is 686544809. The reversal of 686544806 is 608445686.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686544809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6935 + ... + 37698.

It is an arithmetic number, because the mean of its divisors is an integer number (128746773).

Almost surely, 2^686544806 is an apocalyptic number.

686544806 is a deficient number, since it is larger than the sum of its proper divisors (343429378).

686544806 is a wasteful number, since it uses less digits than its factorization.

686544806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52326.

The product of its (nonzero) digits is 1105920, while the sum is 47.

The square root of 686544806 is about 26202.0000381650. Note that the first 4 decimals coincide. The cubic root of 686544806 is about 882.1781468027.

The spelling of 686544806 in words is "six hundred eighty-six million, five hundred forty-four thousand, eight hundred six".