684478016 has 56 divisors (see below), whose sum is σ = 1407444480. Its totient is φ = 330276480.

The previous prime is 684477991. The next prime is 684478019. The reversal of 684478016 is 610874486.

It is a super-3 number, since 3×684478016³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (684478019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1906445 + ... + 1906803.

Almost surely, 2^684478016 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 684478016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703722240).

684478016 is an abundant number, since it is smaller than the sum of its proper divisors (722966464).

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

684478016 is an frugal number, since it uses more digits than its factorization.

684478016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 684478016 is about 26162.5307644349. The cubic root of 684478016 is about 881.2920139854.

The spelling of 684478016 in words is "six hundred eighty-four million, four hundred seventy-eight thousand, sixteen".