686856372 has 48 divisors (see below), whose sum is σ = 1736425152. Its totient is φ = 210470400.

The previous prime is 686856361. The next prime is 686856377. The reversal of 686856372 is 273658686.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686856377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30379 + ... + 47922.

It is an arithmetic number, because the mean of its divisors is an integer number (36175524).

Almost surely, 2^686856372 is an apocalyptic number.

It is an amenable number.

686856372 is an abundant number, since it is smaller than the sum of its proper divisors (1049568780).

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

686856372 is a wasteful number, since it uses less digits than its factorization.

686856372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78368 (or 78366 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The square root of 686856372 is about 26207.9448259492. The cubic root of 686856372 is about 882.3115758940.

It can be divided in two parts, 68685 and 6372, that added together give a palindrome (75057).

The spelling of 686856372 in words is "six hundred eighty-six million, eight hundred fifty-six thousand, three hundred seventy-two".