688533385 has 8 divisors (see below), whose sum is σ = 829669896. Its totient is φ = 548540160.

The previous prime is 688533383. The next prime is 688533397. The reversal of 688533385 is 583335886.

It can be written as a sum of positive squares in 4 ways, for example, as 307932304 + 380601081 = 17548^2 + 19509^2 .

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

It is not a de Polignac number, because 688533385 - 2¹ = 688533383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688533383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284494 + ... + 286903.

It is an arithmetic number, because the mean of its divisors is an integer number (103708737).

Almost surely, 2^688533385 is an apocalyptic number.

It is an amenable number.

688533385 is a deficient number, since it is larger than the sum of its proper divisors (141136511).

688533385 is a wasteful number, since it uses less digits than its factorization.

688533385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571643.

The product of its digits is 2073600, while the sum is 49.

The square root of 688533385 is about 26239.9196835661. The cubic root of 688533385 is about 883.0290696083.

The spelling of 688533385 in words is "six hundred eighty-eight million, five hundred thirty-three thousand, three hundred eighty-five".