685887384 has 128 divisors (see below), whose sum is σ = 2221632000. Its totient is φ = 171362304.

The previous prime is 685887359. The next prime is 685887407. The reversal of 685887384 is 483788586.

It is a happy number.

685887384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33232 + ... + 49760.

It is an arithmetic number, because the mean of its divisors is an integer number (17356500).

Almost surely, 2^685887384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685887384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1110816000).

685887384 is an abundant number, since it is smaller than the sum of its proper divisors (1535744616).

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

685887384 is a wasteful number, since it uses less digits than its factorization.

685887384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16577 (or 16573 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 57.

The square root of 685887384 is about 26189.4517697488. The cubic root of 685887384 is about 881.8964713094.

The spelling of 685887384 in words is "six hundred eighty-five million, eight hundred eighty-seven thousand, three hundred eighty-four".