689442556 has 12 divisors (see below), whose sum is σ = 1316208600. Its totient is φ = 313382960.

The previous prime is 689442473. The next prime is 689442563. The reversal of 689442556 is 655244986.

It is a congruent 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, 7834531 + ... + 7834618.

It is an arithmetic number, because the mean of its divisors is an integer number (109684050).

Almost surely, 2^689442556 is an apocalyptic number.

It is an amenable number.

689442556 is a deficient number, since it is larger than the sum of its proper divisors (626766044).

689442556 is a wasteful number, since it uses less digits than its factorization.

689442556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15669164 (or 15669162 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 49.

The square root of 689442556 is about 26257.2381639806. The cubic root of 689442556 is about 883.4175626655.

The spelling of 689442556 in words is "six hundred eighty-nine million, four hundred forty-two thousand, five hundred fifty-six".