685074293838 has 256 divisors, whose sum is σ = 1725784704000. Its totient is φ = 199642060800.

The previous prime is 685074293731. The next prime is 685074293851. The reversal of 685074293838 is 838392470586.

685074293838 is a `hidden beast` number, since 6 + 8 + 507 + 4 + 2 + 93 + 8 + 38 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 531476698 + ... + 531477986.

It is an arithmetic number, because the mean of its divisors is an integer number (6741346500).

Almost surely, 2^685074293838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685074293838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (862892352000).

685074293838 is an abundant number, since it is smaller than the sum of its proper divisors (1040710410162).

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

685074293838 is a wasteful number, since it uses less digits than its factorization.

685074293838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 63.

The spelling of 685074293838 in words is "six hundred eighty-five billion, seventy-four million, two hundred ninety-three thousand, eight hundred thirty-eight".