684870912 has 216 divisors, whose sum is σ = 2194422048. Its totient is φ = 203673600.

The previous prime is 684870881. The next prime is 684870913. The reversal of 684870912 is 219078486.

It is a super-2 number, since 2×684870912² = 938096332207423488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684870913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1545763 + ... + 1546205.

Almost surely, 2^684870912 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 684870912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097211024).

684870912 is an abundant number, since it is smaller than the sum of its proper divisors (1509551136).

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

684870912 is a wasteful number, since it uses less digits than its factorization.

684870912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 684870912 is about 26170.0384409347. The cubic root of 684870912 is about 881.4606046822.

The spelling of 684870912 in words is "six hundred eighty-four million, eight hundred seventy thousand, nine hundred twelve".