689091028 has 24 divisors (see below), whose sum is σ = 1220373000. Its totient is φ = 340437888.

The previous prime is 689091023. The next prime is 689091037. The reversal of 689091028 is 820190986.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45859984 + 643231044 = 6772^2 + 25362^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689091023) 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 7 ways as a sum of consecutive naturals, for example, 114478 + ... + 120346.

It is an arithmetic number, because the mean of its divisors is an integer number (50848875).

Almost surely, 2^689091028 is an apocalyptic number.

It is an amenable number.

689091028 is a deficient number, since it is larger than the sum of its proper divisors (531281972).

689091028 is a wasteful number, since it uses less digits than its factorization.

689091028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6219 (or 6217 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 689091028 is about 26250.5433848521. The cubic root of 689091028 is about 883.2673936143.

The spelling of 689091028 in words is "six hundred eighty-nine million, ninety-one thousand, twenty-eight".