688404111 has 8 divisors (see below), whose sum is σ = 918990720. Its totient is φ = 458376792.

The previous prime is 688404091. The next prime is 688404113. The reversal of 688404111 is 111404886.

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

It is not a de Polignac number, because 688404111 - 2¹⁷ = 688273039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688404113) 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, 136941 + ... + 141878.

It is an arithmetic number, because the mean of its divisors is an integer number (114873840).

Almost surely, 2^688404111 is an apocalyptic number.

688404111 is a deficient number, since it is larger than the sum of its proper divisors (230586609).

688404111 is a wasteful number, since it uses less digits than its factorization.

688404111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279645.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 688404111 is about 26237.4562600874. The cubic root of 688404111 is about 882.9738024528.

Adding to 688404111 its reverse (111404886), we get a palindrome (799808997).

The spelling of 688404111 in words is "six hundred eighty-eight million, four hundred four thousand, one hundred eleven".