688893 has 4 divisors (see below), whose sum is σ = 918528. Its totient is φ = 459260.

The previous prime is 688889. The next prime is 688907. The reversal of 688893 is 398886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 688893 - 2² = 688889 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688813) 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 3 ways as a sum of consecutive naturals, for example, 114813 + ... + 114818.

It is an arithmetic number, because the mean of its divisors is an integer number (229632).

2⁶⁸⁸⁸⁹³ is an apocalyptic number.

It is an amenable number.

688893 is a deficient number, since it is larger than the sum of its proper divisors (229635).

688893 is a wasteful number, since it uses less digits than its factorization.

688893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229634.

The product of its digits is 82944, while the sum is 42.

The square root of 688893 is about 829.9957831218. The cubic root of 688893 is about 88.3182775653.

The spelling of 688893 in words is "six hundred eighty-eight thousand, eight hundred ninety-three".