685235560 has 64 divisors (see below), whose sum is σ = 1617304320. Its totient is φ = 260985600.

The previous prime is 685235557. The next prime is 685235567. The reversal of 685235560 is 65532586.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (685235567) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 64635 + ... + 74485.

It is an arithmetic number, because the mean of its divisors is an integer number (25270380).

Almost surely, 2^685235560 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 685235560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808652160).

685235560 is an abundant number, since it is smaller than the sum of its proper divisors (932068760).

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

685235560 is a wasteful number, since it uses less digits than its factorization.

685235560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9946 (or 9942 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 685235560 is about 26177.0044122699. The cubic root of 685235560 is about 881.6170165512.

The spelling of 685235560 in words is "six hundred eighty-five million, two hundred thirty-five thousand, five hundred sixty".