685522764288 has 120 divisors (see below), whose sum is σ = 1984790264028. Its totient is φ = 227777052672.

The previous prime is 685522764259. The next prime is 685522764307. The reversal of 685522764288 is 882467225586.

It is a happy number.

685522764288 is a `hidden beast` number, since 6 + 8 + 552 + 2 + 76 + 4 + 2 + 8 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 685504514304 + 18249984 = 827952^2 + 4272^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1204656 + ... + 1679952.

Almost surely, 2^685522764288 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 685522764288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992395132014).

685522764288 is an abundant number, since it is smaller than the sum of its proper divisors (1299267499740).

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

685522764288 is a wasteful number, since it uses less digits than its factorization.

685522764288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475634 (or 475615 counting only the distinct ones).

The product of its digits is 103219200, while the sum is 63.

The spelling of 685522764288 in words is "six hundred eighty-five billion, five hundred twenty-two million, seven hundred sixty-four thousand, two hundred eighty-eight".