689624685 has 40 divisors (see below), whose sum is σ = 1269654936. Its totient is φ = 357851520.

The previous prime is 689624681. The next prime is 689624687. The reversal of 689624685 is 586426986.

It is a happy number.

689624685 is a `hidden beast` number, since 6 + 8 + 9 + 624 + 6 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 404251236 + 285373449 = 20106^2 + 16893^2 .

It is not a de Polignac number, because 689624685 - 2² = 689624681 is a prime.

It is a super-2 number, since 2×689624685² = 951164412322698450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689624681) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8026 + ... + 37995.

Almost surely, 2^689624685 is an apocalyptic number.

It is an amenable number.

689624685 is a deficient number, since it is larger than the sum of its proper divisors (580030251).

689624685 is a wasteful number, since it uses less digits than its factorization.

689624685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46075 (or 46066 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 689624685 is about 26260.7061024642. The cubic root of 689624685 is about 883.4953461782.

The spelling of 689624685 in words is "six hundred eighty-nine million, six hundred twenty-four thousand, six hundred eighty-five".