689815647 has 12 divisors (see below), whose sum is σ = 1055012400. Its totient is φ = 432825408.

The previous prime is 689815631. The next prime is 689815649. The reversal of 689815647 is 746518986.

689815647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 689815647 - 2⁴ = 689815631 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 689815593 and 689815602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689815649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2254147 + ... + 2254452.

It is an arithmetic number, because the mean of its divisors is an integer number (87917700).

Almost surely, 2^689815647 is an apocalyptic number.

689815647 is a deficient number, since it is larger than the sum of its proper divisors (365196753).

689815647 is a wasteful number, since it uses less digits than its factorization.

689815647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4508622 (or 4508619 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 689815647 is about 26264.3417393241. The cubic root of 689815647 is about 883.5768873758.

The spelling of 689815647 in words is "six hundred eighty-nine million, eight hundred fifteen thousand, six hundred forty-seven".