684913920 has 144 divisors (see below), whose sum is σ = 2202221952. Its totient is φ = 181411840.

The previous prime is 684913891. The next prime is 684913951. The reversal of 684913920 is 29319486.

It is a congruent 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, 663805 + ... + 664835.

It is an arithmetic number, because the mean of its divisors is an integer number (15293208).

Almost surely, 2^684913920 is an apocalyptic number.

684913920 is a gapful number since it is divisible by the number (60) 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 684913920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101110976).

684913920 is an abundant number, since it is smaller than the sum of its proper divisors (1517308032).

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

684913920 is a wasteful number, since it uses less digits than its factorization.

684913920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 684913920 is about 26170.8601310694. The cubic root of 684913920 is about 881.4790553924.

The spelling of 684913920 in words is "six hundred eighty-four million, nine hundred thirteen thousand, nine hundred twenty".