688090 has 32 divisors (see below), whose sum is σ = 1370880. Its totient is φ = 247104.

The previous prime is 688087. The next prime is 688097. The reversal of 688090 is 90886.

688090 is nontrivially palindromic in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8671 + ... + 8749.

It is an arithmetic number, because the mean of its divisors is an integer number (42840).

2⁶⁸⁸⁰⁹⁰ is an apocalyptic number.

688090 is a deficient number, since it is larger than the sum of its proper divisors (682790).

688090 is a wasteful number, since it uses less digits than its factorization.

688090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 688090 is about 829.5119046765. The cubic root of 688090 is about 88.2839485039.

The spelling of 688090 in words is "six hundred eighty-eight thousand, ninety".