689538605 has 32 divisors (see below), whose sum is σ = 966574080. Its totient is φ = 462450240.

The previous prime is 689538601. The next prime is 689538653. The reversal of 689538605 is 506835986.

It is not a de Polignac number, because 689538605 - 2² = 689538601 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689538601) 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 31 ways as a sum of consecutive naturals, for example, 468020 + ... + 469490.

It is an arithmetic number, because the mean of its divisors is an integer number (30205440).

Almost surely, 2^689538605 is an apocalyptic number.

It is an amenable number.

689538605 is a deficient number, since it is larger than the sum of its proper divisors (277035475).

689538605 is a wasteful number, since it uses less digits than its factorization.

689538605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 689538605 is about 26259.0671007178. The cubic root of 689538605 is about 883.4585849052.

The spelling of 689538605 in words is "six hundred eighty-nine million, five hundred thirty-eight thousand, six hundred five".