687228117 has 4 divisors (see below), whose sum is σ = 916304160. Its totient is φ = 458152076.

The previous prime is 687228103. The next prime is 687228137. The reversal of 687228117 is 711822786.

687228117 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687228117 is a prime.

It is a super-3 number, since 3×687228117³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687228137) 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, 114538017 + ... + 114538022.

It is an arithmetic number, because the mean of its divisors is an integer number (229076040).

Almost surely, 2^687228117 is an apocalyptic number.

It is an amenable number.

687228117 is a deficient number, since it is larger than the sum of its proper divisors (229076043).

687228117 is a wasteful number, since it uses less digits than its factorization.

687228117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229076042.

The product of its digits is 75264, while the sum is 42.

The square root of 687228117 is about 26215.0360861853. The cubic root of 687228117 is about 882.4707240433.

The spelling of 687228117 in words is "six hundred eighty-seven million, two hundred twenty-eight thousand, one hundred seventeen".