685905258528 has 384 divisors, whose sum is σ = 2304409927680. Its totient is φ = 194431104000.

The previous prime is 685905258487. The next prime is 685905258541. The reversal of 685905258528 is 825852509586.

685905258528 is a `hidden beast` number, since 6 + 8 + 5 + 9 + 0 + 52 + 58 + 528 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 728910538 + ... + 728911478.

It is an arithmetic number, because the mean of its divisors is an integer number (6001067520).

Almost surely, 2^685905258528 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 685905258528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1152204963840).

685905258528 is an abundant number, since it is smaller than the sum of its proper divisors (1618504669152).

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

685905258528 is a wasteful number, since it uses less digits than its factorization.

685905258528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 69120000, while the sum is 63.

The spelling of 685905258528 in words is "six hundred eighty-five billion, nine hundred five million, two hundred fifty-eight thousand, five hundred twenty-eight".