686375787 has 4 divisors (see below), whose sum is σ = 915167720. Its totient is φ = 457583856.

The previous prime is 686375747. The next prime is 686375791. The reversal of 686375787 is 787573686.

686375787 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 not a de Polignac number, because 686375787 - 2¹⁸ = 686113643 is a prime.

It is a super-2 number, since 2×686375787² = 942223441959738738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686375717) 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, 114395962 + ... + 114395967.

It is an arithmetic number, because the mean of its divisors is an integer number (228791930).

Almost surely, 2^686375787 is an apocalyptic number.

686375787 is a deficient number, since it is larger than the sum of its proper divisors (228791933).

686375787 is a wasteful number, since it uses less digits than its factorization.

686375787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228791932.

The product of its digits is 11854080, while the sum is 57.

The square root of 686375787 is about 26198.7745324090. The cubic root of 686375787 is about 882.1057470096.

The spelling of 686375787 in words is "six hundred eighty-six million, three hundred seventy-five thousand, seven hundred eighty-seven".