689557 has 4 divisors (see below), whose sum is σ = 752256. Its totient is φ = 626860.

The previous prime is 689551. The next prime is 689561. The reversal of 689557 is 755986.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-689557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689551) 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, 31333 + ... + 31354.

It is an arithmetic number, because the mean of its divisors is an integer number (188064).

2⁶⁸⁹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

689557 is a deficient number, since it is larger than the sum of its proper divisors (62699).

689557 is a wasteful number, since it uses less digits than its factorization.

689557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62698.

The product of its digits is 75600, while the sum is 40.

The square root of 689557 is about 830.3956888135. The cubic root of 689557 is about 88.3466440920.

The spelling of 689557 in words is "six hundred eighty-nine thousand, five hundred fifty-seven".