689951440 has 20 divisors (see below), whose sum is σ = 1604137284. Its totient is φ = 275980544.

The previous prime is 689951411. The next prime is 689951459. The reversal of 689951440 is 44159986.

It is a happy number.

689951440 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 523128384 + 166823056 = 22872^2 + 12916^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4312117 + ... + 4312276.

Almost surely, 2^689951440 is an apocalyptic number.

It is an amenable number.

689951440 is an abundant number, since it is smaller than the sum of its proper divisors (914185844).

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

689951440 is a wasteful number, since it uses less digits than its factorization.

689951440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8624406 (or 8624400 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 689951440 is about 26266.9267330611. The cubic root of 689951440 is about 883.6348621330.

The spelling of 689951440 in words is "six hundred eighty-nine million, nine hundred fifty-one thousand, four hundred forty".