684273920 has 144 divisors (see below), whose sum is σ = 1866678912. Its totient is φ = 237895680.

The previous prime is 684273899. The next prime is 684273977. The reversal of 684273920 is 29372486.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322784 + ... + 324896.

It is an arithmetic number, because the mean of its divisors is an integer number (12963048).

Almost surely, 2^684273920 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 684273920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933339456).

684273920 is an abundant number, since it is smaller than the sum of its proper divisors (1182404992).

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

684273920 is a wasteful number, since it uses less digits than its factorization.

684273920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168 (or 2154 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 684273920 is about 26158.6299335420. The cubic root of 684273920 is about 881.2044114371.

The spelling of 684273920 in words is "six hundred eighty-four million, two hundred seventy-three thousand, nine hundred twenty".