689905028 has 12 divisors (see below), whose sum is σ = 1230114060. Its totient is φ = 338443872.

The previous prime is 689905009. The next prime is 689905039. The reversal of 689905028 is 820509986.

It can be written as a sum of positive squares in 2 ways, for example, as 295564864 + 394340164 = 17192^2 + 19858^2 .

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, 1626923 + ... + 1627346.

It is an arithmetic number, because the mean of its divisors is an integer number (102509505).

Almost surely, 2^689905028 is an apocalyptic number.

It is an amenable number.

689905028 is a deficient number, since it is larger than the sum of its proper divisors (540209032).

689905028 is a wasteful number, since it uses less digits than its factorization.

689905028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254326 (or 3254324 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 689905028 is about 26266.0432497931. The cubic root of 689905028 is about 883.6150480908.

The spelling of 689905028 in words is "six hundred eighty-nine million, nine hundred five thousand, twenty-eight".