685297536 has 384 divisors, whose sum is σ = 2387616000. Its totient is φ = 173859840.

The previous prime is 685297517. The next prime is 685297541. The reversal of 685297536 is 635792586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15937131 + ... + 15937173.

It is an arithmetic number, because the mean of its divisors is an integer number (6217750).

Almost surely, 2^685297536 is an apocalyptic number.

685297536 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685297536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1193808000).

685297536 is an abundant number, since it is smaller than the sum of its proper divisors (1702318464).

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

685297536 is a wasteful number, since it uses less digits than its factorization.

685297536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 66 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 51.

The square root of 685297536 is about 26178.1881725990. The cubic root of 685297536 is about 881.6435949777.

The spelling of 685297536 in words is "six hundred eighty-five million, two hundred ninety-seven thousand, five hundred thirty-six".