689851970 has 8 divisors (see below), whose sum is σ = 1241733564. Its totient is φ = 275940784.

The previous prime is 689851961. The next prime is 689851973. The reversal of 689851970 is 79158986.

It can be written as a sum of positive squares in 2 ways, for example, as 679592761 + 10259209 = 26069^2 + 3203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (689851973) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 34492589 + ... + 34492608.

Almost surely, 2^689851970 is an apocalyptic number.

689851970 is a deficient number, since it is larger than the sum of its proper divisors (551881594).

689851970 is a wasteful number, since it uses less digits than its factorization.

689851970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68985204.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 689851970 is about 26265.0332190919. The cubic root of 689851970 is about 883.5923956738.

The spelling of 689851970 in words is "six hundred eighty-nine million, eight hundred fifty-one thousand, nine hundred seventy".