689662138 has 16 divisors (see below), whose sum is σ = 1139715360. Its totient is φ = 310378000.

The previous prime is 689662123. The next prime is 689662159. The reversal of 689662138 is 831266986.

It is a happy number.

689662138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 689662091 and 689662100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152968 + ... + 157411.

It is an arithmetic number, because the mean of its divisors is an integer number (71232210).

Almost surely, 2^689662138 is an apocalyptic number.

689662138 is a deficient number, since it is larger than the sum of its proper divisors (450053222).

689662138 is a wasteful number, since it uses less digits than its factorization.

689662138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310493.

The product of its digits is 746496, while the sum is 49.

The square root of 689662138 is about 26261.4191924199. The cubic root of 689662138 is about 883.5113398788.

The spelling of 689662138 in words is "six hundred eighty-nine million, six hundred sixty-two thousand, one hundred thirty-eight".