688998 has 8 divisors (see below), whose sum is σ = 1378008. Its totient is φ = 229664.

The previous prime is 688979. The next prime is 688999. The reversal of 688998 is 899886.

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

688998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57411 + ... + 57422.

It is an arithmetic number, because the mean of its divisors is an integer number (172251).

2⁶⁸⁸⁹⁹⁸ is an apocalyptic number.

688998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688998 is a wasteful number, since it uses less digits than its factorization.

688998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114838.

The product of its digits is 248832, while the sum is 48.

The square root of 688998 is about 830.0590340452. The cubic root of 688998 is about 88.3227644489.

The spelling of 688998 in words is "six hundred eighty-eight thousand, nine hundred ninety-eight".