684478573 has 4 divisors (see below), whose sum is σ = 684592668. Its totient is φ = 684364480.

The previous prime is 684478549. The next prime is 684478579. The reversal of 684478573 is 375874486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 495196009 + 189282564 = 22253^2 + 13758^2 .

It is a cyclic number.

It is not a de Polignac number, because 684478573 - 2²¹ = 682381421 is a prime.

It is a super-2 number, since 2×684478573² = 937021833792232658, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684478573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684478579) by changing a digit.

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, 47518 + ... + 60223.

It is an arithmetic number, because the mean of its divisors is an integer number (171148167).

Almost surely, 2^684478573 is an apocalyptic number.

It is an amenable number.

684478573 is a deficient number, since it is larger than the sum of its proper divisors (114095).

684478573 is a wasteful number, since it uses less digits than its factorization.

684478573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114094.

The product of its digits is 4515840, while the sum is 52.

The square root of 684478573 is about 26162.5414094273. The cubic root of 684478573 is about 881.2922530384.

The spelling of 684478573 in words is "six hundred eighty-four million, four hundred seventy-eight thousand, five hundred seventy-three".