688790 has 8 divisors (see below), whose sum is σ = 1239840. Its totient is φ = 275512.

The previous prime is 688783. The next prime is 688799. The reversal of 688790 is 97886.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688799) 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, 34430 + ... + 34449.

It is an arithmetic number, because the mean of its divisors is an integer number (154980).

2⁶⁸⁸⁷⁹⁰ is an apocalyptic number.

688790 is a deficient number, since it is larger than the sum of its proper divisors (551050).

688790 is a wasteful number, since it uses less digits than its factorization.

688790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68886.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 688790 is about 829.9337322943. The cubic root of 688790 is about 88.3138757032.

The spelling of 688790 in words is "six hundred eighty-eight thousand, seven hundred ninety".