689478381 has 12 divisors (see below), whose sum is σ = 996467680. Its totient is φ = 459396360.

The previous prime is 689478329. The next prime is 689478389. The reversal of 689478381 is 183874986.

689478381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 689478381 - 2¹³ = 689470189 is a prime.

It is a super-2 number, since 2×689478381² = 950760875732762322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689478389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3475 + ... + 37296.

Almost surely, 2^689478381 is an apocalyptic number.

It is an amenable number.

689478381 is a deficient number, since it is larger than the sum of its proper divisors (306989299).

689478381 is a wasteful number, since it uses less digits than its factorization.

689478381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42656 (or 42653 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 689478381 is about 26257.9203479636. The cubic root of 689478381 is about 883.4328638610.

The spelling of 689478381 in words is "six hundred eighty-nine million, four hundred seventy-eight thousand, three hundred eighty-one".