689912645 has 16 divisors (see below), whose sum is σ = 833690880. Its totient is φ = 548081664.

The previous prime is 689912621. The next prime is 689912647. The reversal of 689912645 is 546219986.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689912645 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689912593 and 689912602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689912647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 563504 + ... + 564726.

It is an arithmetic number, because the mean of its divisors is an integer number (52105680).

Almost surely, 2^689912645 is an apocalyptic number.

It is an amenable number.

689912645 is a deficient number, since it is larger than the sum of its proper divisors (143778235).

689912645 is a wasteful number, since it uses less digits than its factorization.

689912645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924.

The product of its digits is 933120, while the sum is 50.

The square root of 689912645 is about 26266.1882464891. The cubic root of 689912645 is about 883.6182999737.

The spelling of 689912645 in words is "six hundred eighty-nine million, nine hundred twelve thousand, six hundred forty-five".