689442557 has 8 divisors (see below), whose sum is σ = 702293592. Its totient is φ = 676641600.

The previous prime is 689442473. The next prime is 689442563. The reversal of 689442557 is 755244986.

689442557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15832441 + 673610116 = 3979^2 + 25954^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689442557 - 2²⁶ = 622333693 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 (689442857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15863 + ... + 40379.

It is an arithmetic number, because the mean of its divisors is an integer number (87786699).

Almost surely, 2^689442557 is an apocalyptic number.

It is an amenable number.

689442557 is a deficient number, since it is larger than the sum of its proper divisors (12851035).

689442557 is a wasteful number, since it uses less digits than its factorization.

689442557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25039.

The product of its digits is 2419200, while the sum is 50.

The square root of 689442557 is about 26257.2381830230. The cubic root of 689442557 is about 883.4175630926.

The spelling of 689442557 in words is "six hundred eighty-nine million, four hundred forty-two thousand, five hundred fifty-seven".