689566650 has 24 divisors (see below), whose sum is σ = 1710125664. Its totient is φ = 183884400.

The previous prime is 689566649. The next prime is 689566651. The reversal of 689566650 is 56665986.

It is an interprime number because it is at equal distance from previous prime (689566649) and next prime (689566651).

It is a junction number, because it is equal to n+sod(n) for n = 689566593 and 689566602.

It is not an unprimeable number, because it can be changed into a prime (689566651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2298406 + ... + 2298705.

It is an arithmetic number, because the mean of its divisors is an integer number (71255236).

Almost surely, 2^689566650 is an apocalyptic number.

689566650 is an abundant number, since it is smaller than the sum of its proper divisors (1020559014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689566650 is a wasteful number, since it uses less digits than its factorization.

689566650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597126 (or 4597121 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 51.

The square root of 689566650 is about 26259.6011013115. The cubic root of 689566650 is about 883.4705621221.

The spelling of 689566650 in words is "six hundred eighty-nine million, five hundred sixty-six thousand, six hundred fifty".