686388263 has 4 divisors (see below), whose sum is σ = 748787208. Its totient is φ = 623989320.

The previous prime is 686388253. The next prime is 686388289. The reversal of 686388263 is 362883686.

686388263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686388263 - 2⁴ = 686388247 is a prime.

It is a super-2 number, since 2×686388263² = 942257695168314338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686388253) 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, 31199456 + ... + 31199477.

It is an arithmetic number, because the mean of its divisors is an integer number (187196802).

Almost surely, 2^686388263 is an apocalyptic number.

686388263 is a deficient number, since it is larger than the sum of its proper divisors (62398945).

686388263 is a wasteful number, since it uses less digits than its factorization.

686388263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62398944.

The product of its digits is 1990656, while the sum is 50.

The square root of 686388263 is about 26199.0126340670. The cubic root of 686388263 is about 882.1110915477. Note that the first 3 decimals are identical.

The spelling of 686388263 in words is "six hundred eighty-six million, three hundred eighty-eight thousand, two hundred sixty-three".