686868237 has 18 divisors (see below), whose sum is σ = 1090539086. Its totient is φ = 416283120.

The previous prime is 686868191. The next prime is 686868241. The reversal of 686868237 is 732868686.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 625700196 + 61168041 = 25014^2 + 7821^2 .

It is not a de Polignac number, because 686868237 - 2⁸ = 686867981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686868257) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 314278 + ... + 316455.

Almost surely, 2^686868237 is an apocalyptic number.

It is an amenable number.

686868237 is a deficient number, since it is larger than the sum of its proper divisors (403670849).

686868237 is a wasteful number, since it uses less digits than its factorization.

686868237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630761 (or 630747 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 686868237 is about 26208.1711876277. The cubic root of 686868237 is about 882.3166563189.

The spelling of 686868237 in words is "six hundred eighty-six million, eight hundred sixty-eight thousand, two hundred thirty-seven".