685537488 has 120 divisors (see below), whose sum is σ = 1973088000. Its totient is φ = 222089472.

The previous prime is 685537403. The next prime is 685537547. The reversal of 685537488 is 884735586.

685537488 is a `hidden beast` number, since 6 + 8 + 553 + 7 + 4 + 88 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1346578 + ... + 1347086.

It is an arithmetic number, because the mean of its divisors is an integer number (16442400).

Almost surely, 2^685537488 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 685537488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986544000).

685537488 is an abundant number, since it is smaller than the sum of its proper divisors (1287550512).

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

685537488 is a wasteful number, since it uses less digits than its factorization.

685537488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 760 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 54.

The square root of 685537488 is about 26182.7708235779. The cubic root of 685537488 is about 881.7464833566.

The spelling of 685537488 in words is "six hundred eighty-five million, five hundred thirty-seven thousand, four hundred eighty-eight".