689505986 has 8 divisors (see below), whose sum is σ = 1113817404. Its totient is φ = 318233520.

The previous prime is 689505961. The next prime is 689506019.

689505986 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 542004961 + 147501025 = 23281^2 + 12145^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13259705 + ... + 13259756.

Almost surely, 2^689505986 is an apocalyptic number.

689505986 is a deficient number, since it is larger than the sum of its proper divisors (424311418).

689505986 is a wasteful number, since it uses less digits than its factorization.

689505986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26519476.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The square root of 689505986 is about 26258.4459936227. The cubic root of 689505986 is about 883.4446538554. Note that the first 3 decimals are identical.

The spelling of 689505986 in words is "six hundred eighty-nine million, five hundred five thousand, nine hundred eighty-six".