689406656 has 28 divisors (see below), whose sum is σ = 1373124000. Its totient is φ = 343422720.

The previous prime is 689406649. The next prime is 689406703. The reversal of 689406656 is 656604986.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2531 + ... + 37218.

Almost surely, 2^689406656 is an apocalyptic number.

It is an amenable number.

689406656 is a deficient number, since it is larger than the sum of its proper divisors (683717344).

689406656 is a wasteful number, since it uses less digits than its factorization.

689406656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40032 (or 40022 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 50.

The square root of 689406656 is about 26256.5545340587. The cubic root of 689406656 is about 883.4022289051.

The spelling of 689406656 in words is "six hundred eighty-nine million, four hundred six thousand, six hundred fifty-six".