689545 has 4 divisors (see below), whose sum is σ = 827460. Its totient is φ = 551632.

The previous prime is 689509. The next prime is 689551. The reversal of 689545 is 545986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 210681 + 478864 = 459^2 + 692^2 .

It is a cyclic number.

It is not a de Polignac number, because 689545 - 2⁹ = 689033 is a prime.

689545 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68950 + ... + 68959.

It is an arithmetic number, because the mean of its divisors is an integer number (206865).

2⁶⁸⁹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

689545 is a deficient number, since it is larger than the sum of its proper divisors (137915).

689545 is a wasteful number, since it uses less digits than its factorization.

689545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137914.

The product of its digits is 43200, while the sum is 37.

The square root of 689545 is about 830.3884633110. The cubic root of 689545 is about 88.3461316055.

The spelling of 689545 in words is "six hundred eighty-nine thousand, five hundred forty-five".