685084544 has 32 divisors (see below), whose sum is σ = 1370994240. Its totient is φ = 340992000.

The previous prime is 685084507. The next prime is 685084553. The reversal of 685084544 is 445480586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 685084495 and 685084504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16544 + ... + 40544.

It is an arithmetic number, because the mean of its divisors is an integer number (42843570).

Almost surely, 2^685084544 is an apocalyptic number.

685084544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685084544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685497120).

685084544 is an abundant number, since it is smaller than the sum of its proper divisors (685909696).

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

685084544 is a wasteful number, since it uses less digits than its factorization.

685084544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24238 (or 24226 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 44.

The square root of 685084544 is about 26174.1197368699. The cubic root of 685084544 is about 881.5522465825.

The spelling of 685084544 in words is "six hundred eighty-five million, eighty-four thousand, five hundred forty-four".