685000486638 has 128 divisors (see below), whose sum is σ = 1663348055040. Its totient is φ = 207683118720.

The previous prime is 685000486631. The next prime is 685000486741. The reversal of 685000486638 is 836684000586.

685000486638 is a `hidden beast` number, since 6 + 8 + 500 + 0 + 48 + 66 + 38 = 666.

It is a super-3 number, since 3×685000486638³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685000486631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 134919756 + ... + 134924832.

It is an arithmetic number, because the mean of its divisors is an integer number (12994906680).

Almost surely, 2^685000486638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685000486638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831674027520).

685000486638 is an abundant number, since it is smaller than the sum of its proper divisors (978347568402).

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

685000486638 is a wasteful number, since it uses less digits than its factorization.

685000486638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7879 (or 7873 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 685000486638 in words is "six hundred eighty-five billion, four hundred eighty-six thousand, six hundred thirty-eight".