689129985 has 16 divisors (see below), whose sum is σ = 1105496064. Its totient is φ = 366573312.

The previous prime is 689129957. The next prime is 689129989. The reversal of 689129985 is 589921986.

It is not a de Polignac number, because 689129985 - 2¹⁷ = 688998913 is a prime.

It is a super-2 number, since 2×689129985² = 949800272452200450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (689129989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54232 + ... + 65721.

It is an arithmetic number, because the mean of its divisors is an integer number (69093504).

Almost surely, 2^689129985 is an apocalyptic number.

It is an amenable number.

689129985 is a deficient number, since it is larger than the sum of its proper divisors (416366079).

689129985 is a wasteful number, since it uses less digits than its factorization.

689129985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120344.

The product of its digits is 2799360, while the sum is 57.

The square root of 689129985 is about 26251.2853971001. The cubic root of 689129985 is about 883.2840381494.

The spelling of 689129985 in words is "six hundred eighty-nine million, one hundred twenty-nine thousand, nine hundred eighty-five".