689621628 has 12 divisors (see below), whose sum is σ = 1609117160. Its totient is φ = 229873872.

The previous prime is 689621623. The next prime is 689621759. The reversal of 689621628 is 826126986.

It is a happy number.

689621628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689621623) 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, 28734223 + ... + 28734246.

Almost surely, 2^689621628 is an apocalyptic number.

It is an amenable number.

689621628 is an abundant number, since it is smaller than the sum of its proper divisors (919495532).

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

689621628 is a wasteful number, since it uses less digits than its factorization.

689621628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57468476 (or 57468474 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 689621628 is about 26260.6478975672. The cubic root of 689621628 is about 883.4940407100.

The spelling of 689621628 in words is "six hundred eighty-nine million, six hundred twenty-one thousand, six hundred twenty-eight".