688069 has 4 divisors (see below), whose sum is σ = 690880. Its totient is φ = 685260.

The previous prime is 688067. The next prime is 688073. The reversal of 688069 is 960886.

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 688069 - 2¹ = 688067 is a prime.

It is a super-2 number, since 2×688069² = 946877897522, which contains 22 as substring.

It is a Duffinian number.

688069 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688063) 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 3 ways as a sum of consecutive naturals, for example, 999 + ... + 1540.

It is an arithmetic number, because the mean of its divisors is an integer number (172720).

2⁶⁸⁸⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

688069 is a deficient number, since it is larger than the sum of its proper divisors (2811).

688069 is a wasteful number, since it uses less digits than its factorization.

688069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 688069 is about 829.4992465337. The cubic root of 688069 is about 88.2830503744.

The spelling of 688069 in words is "six hundred eighty-eight thousand, sixty-nine".