688216385 has 8 divisors (see below), whose sum is σ = 869326080. Its totient is φ = 521595504.

The previous prime is 688216367. The next prime is 688216387. The reversal of 688216385 is 583612886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 688216385 - 2⁸ = 688216129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688216387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3622097 + ... + 3622286.

It is an arithmetic number, because the mean of its divisors is an integer number (108665760).

Almost surely, 2^688216385 is an apocalyptic number.

It is an amenable number.

688216385 is a deficient number, since it is larger than the sum of its proper divisors (181109695).

688216385 is a wasteful number, since it uses less digits than its factorization.

688216385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7244407.

The product of its digits is 552960, while the sum is 47.

The square root of 688216385 is about 26233.8785733258. The cubic root of 688216385 is about 882.8935336074.

The spelling of 688216385 in words is "six hundred eighty-eight million, two hundred sixteen thousand, three hundred eighty-five".