685987328 has 80 divisors (see below), whose sum is σ = 1540588896. Its totient is φ = 302776320.

The previous prime is 685987327. The next prime is 685987331. The reversal of 685987328 is 823789586.

It is a super-2 number, since 2×685987328² = 941157228353159168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685987327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150848 + ... + 155328.

Almost surely, 2^685987328 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 685987328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770294448).

685987328 is an abundant number, since it is smaller than the sum of its proper divisors (854601568).

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

685987328 is a wasteful number, since it uses less digits than its factorization.

685987328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535 (or 4519 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The square root of 685987328 is about 26191.3597966963. The cubic root of 685987328 is about 881.9393043761.

The spelling of 685987328 in words is "six hundred eighty-five million, nine hundred eighty-seven thousand, three hundred twenty-eight".