689710644 has 36 divisors (see below), whose sum is σ = 1992498144. Its totient is φ = 197060112.

The previous prime is 689710631. The next prime is 689710657. The reversal of 689710644 is 446017986.

It is an interprime number because it is at equal distance from previous prime (689710631) and next prime (689710657).

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 689710644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1368222 + ... + 1368725.

Almost surely, 2^689710644 is an apocalyptic number.

It is an amenable number.

689710644 is an abundant number, since it is smaller than the sum of its proper divisors (1302787500).

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

689710644 is a wasteful number, since it uses less digits than its factorization.

689710644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736964 (or 2736959 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 689710644 is about 26262.3426982438. The cubic root of 689710644 is about 883.5320527245.

The spelling of 689710644 in words is "six hundred eighty-nine million, seven hundred ten thousand, six hundred forty-four".