686168272 has 20 divisors (see below), whose sum is σ = 1335263620. Its totient is φ = 341584128.

The previous prime is 686168233. The next prime is 686168279. The reversal of 686168272 is 272861686.

It can be written as a sum of positive squares in 2 ways, for example, as 291589776 + 394578496 = 17076^2 + 19864^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686168279) 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, 89973 + ... + 97300.

It is an arithmetic number, because the mean of its divisors is an integer number (66763181).

Almost surely, 2^686168272 is an apocalyptic number.

It is an amenable number.

686168272 is a deficient number, since it is larger than the sum of its proper divisors (649095348).

686168272 is a wasteful number, since it uses less digits than its factorization.

686168272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187510 (or 187504 counting only the distinct ones).

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

The square root of 686168272 is about 26194.8138378573. The cubic root of 686168272 is about 882.0168410837.

The spelling of 686168272 in words is "six hundred eighty-six million, one hundred sixty-eight thousand, two hundred seventy-two".