685996444 has 96 divisors (see below), whose sum is σ = 1546352640. Its totient is φ = 259200000.

The previous prime is 685996439. The next prime is 685996453. The reversal of 685996444 is 444699586.

It is a super-2 number, since 2×685996444² = 941182242361290272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 913069 + ... + 913819.

It is an arithmetic number, because the mean of its divisors is an integer number (16107840).

Almost surely, 2^685996444 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 685996444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773176320).

685996444 is an abundant number, since it is smaller than the sum of its proper divisors (860356196).

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

685996444 is a wasteful number, since it uses less digits than its factorization.

685996444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 897 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 55.

The square root of 685996444 is about 26191.5338229742. The cubic root of 685996444 is about 881.9432110193.

The spelling of 685996444 in words is "six hundred eighty-five million, nine hundred ninety-six thousand, four hundred forty-four".