689591745 has 64 divisors (see below), whose sum is σ = 1289779200. Its totient is φ = 349090560.

The previous prime is 689591717. The next prime is 689591759. The reversal of 689591745 is 547195986.

689591745 is a `hidden beast` number, since 6 + 8 + 9 + 591 + 7 + 45 = 666.

It is not a de Polignac number, because 689591745 - 2¹⁴ = 689575361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689591691 and 689591700.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 220251 + ... + 223359.

It is an arithmetic number, because the mean of its divisors is an integer number (20152800).

Almost surely, 2^689591745 is an apocalyptic number.

It is an amenable number.

689591745 is a deficient number, since it is larger than the sum of its proper divisors (600187455).

689591745 is a wasteful number, since it uses less digits than its factorization.

689591745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207 (or 3201 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 689591745 is about 26260.0789221967. The cubic root of 689591745 is about 883.4812792030.

The spelling of 689591745 in words is "six hundred eighty-nine million, five hundred ninety-one thousand, seven hundred forty-five".