688173385 has 16 divisors (see below), whose sum is σ = 835421184. Its totient is φ = 544151232.

The previous prime is 688173383. The next prime is 688173401. The reversal of 688173385 is 583371886.

It is a cyclic number.

It is not a de Polignac number, because 688173385 - 2¹ = 688173383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688173383) 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 15 ways as a sum of consecutive naturals, for example, 376584 + ... + 378406.

It is an arithmetic number, because the mean of its divisors is an integer number (52213824).

Almost surely, 2^688173385 is an apocalyptic number.

It is an amenable number.

688173385 is a deficient number, since it is larger than the sum of its proper divisors (147247799).

688173385 is a wasteful number, since it uses less digits than its factorization.

688173385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664.

The product of its digits is 967680, while the sum is 49.

The square root of 688173385 is about 26233.0590095780. The cubic root of 688173385 is about 882.8751453924.

The spelling of 688173385 in words is "six hundred eighty-eight million, one hundred seventy-three thousand, three hundred eighty-five".