686812672 has 80 divisors (see below), whose sum is σ = 1689079392. Its totient is φ = 271687680.

The previous prime is 686812667. The next prime is 686812681. The reversal of 686812672 is 276218686.

686812672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39222 + ... + 53962.

Almost surely, 2^686812672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686812672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844539696).

686812672 is an abundant number, since it is smaller than the sum of its proper divisors (1002266720).

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

686812672 is a wasteful number, since it uses less digits than its factorization.

686812672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14779 (or 14763 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 686812672 is about 26207.1110960365. Note that the first 3 decimals coincide. The cubic root of 686812672 is about 882.2928636687.

The spelling of 686812672 in words is "six hundred eighty-six million, eight hundred twelve thousand, six hundred seventy-two".