685237644 has 288 divisors, whose sum is σ = 2264743936. Its totient is φ = 176359680.

The previous prime is 685237601. The next prime is 685237673. The reversal of 685237644 is 446732586.

685237644 is a `hidden beast` number, since 68 + 523 + 7 + 64 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 685237644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5395509 + ... + 5395635.

Almost surely, 2^685237644 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 685237644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132371968).

685237644 is an abundant number, since it is smaller than the sum of its proper divisors (1579506292).

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

685237644 is a wasteful number, since it uses less digits than its factorization.

685237644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 213 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 685237644 is about 26177.0442181695. The cubic root of 685237644 is about 881.6179103012.

It can be divided in two parts, 68523 and 7644, that added together give a palindrome (76167).

The spelling of 685237644 in words is "six hundred eighty-five million, two hundred thirty-seven thousand, six hundred forty-four".