689955579 has 6 divisors (see below), whose sum is σ = 996602516. Its totient is φ = 459970380.

The previous prime is 689955571. The next prime is 689955593. The reversal of 689955579 is 975559986.

689955579 is a `hidden beast` number, since 6 + 8 + 9 + 9 + 55 + 579 = 666.

It is not a de Polignac number, because 689955579 - 2³ = 689955571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689955571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38330857 + ... + 38330874.

Almost surely, 2^689955579 is an apocalyptic number.

689955579 is a deficient number, since it is larger than the sum of its proper divisors (306646937).

689955579 is a wasteful number, since it uses less digits than its factorization.

689955579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76661737 (or 76661734 counting only the distinct ones).

The product of its digits is 30618000, while the sum is 63.

The square root of 689955579 is about 26267.0055202339. The cubic root of 689955579 is about 883.6366290967.

The spelling of 689955579 in words is "six hundred eighty-nine million, nine hundred fifty-five thousand, five hundred seventy-nine".