689566420 has 12 divisors (see below), whose sum is σ = 1448089524. Its totient is φ = 275826560.

The previous prime is 689566391. The next prime is 689566421. The reversal of 689566420 is 24665986.

689566420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 489117456 + 200448964 = 22116^2 + 14158^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689566421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17239141 + ... + 17239180.

It is an arithmetic number, because the mean of its divisors is an integer number (120674127).

Almost surely, 2^689566420 is an apocalyptic number.

It is an amenable number.

689566420 is an abundant number, since it is smaller than the sum of its proper divisors (758523104).

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

689566420 is a wasteful number, since it uses less digits than its factorization.

689566420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34478330 (or 34478328 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 689566420 is about 26259.5967219605. The cubic root of 689566420 is about 883.4704638970.

It can be divided in two parts, 689566 and 420, that added together give a palindrome (689986).

The spelling of 689566420 in words is "six hundred eighty-nine million, five hundred sixty-six thousand, four hundred twenty".