688854136 has 16 divisors (see below), whose sum is σ = 1297396800. Its totient is φ = 342881664.

The previous prime is 688854121. The next prime is 688854169. The reversal of 688854136 is 631458886.

It is a self number, because there is not a number n which added to its sum of digits gives 688854136.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 191281 + ... + 194848.

It is an arithmetic number, because the mean of its divisors is an integer number (81087300).

Almost surely, 2^688854136 is an apocalyptic number.

It is an amenable number.

688854136 is a deficient number, since it is larger than the sum of its proper divisors (608542664).

688854136 is a wasteful number, since it uses less digits than its factorization.

688854136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386358 (or 386354 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The square root of 688854136 is about 26246.0308618275. The cubic root of 688854136 is about 883.1661670455.

The spelling of 688854136 in words is "six hundred eighty-eight million, eight hundred fifty-four thousand, one hundred thirty-six".