684842820 has 48 divisors (see below), whose sum is σ = 1925972160. Its totient is φ = 181823616.

The previous prime is 684842813. The next prime is 684842831. The reversal of 684842820 is 28248486.

684842820 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

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, 11182 + ... + 38661.

It is an arithmetic number, because the mean of its divisors is an integer number (40124420).

Almost surely, 2^684842820 is an apocalyptic number.

684842820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684842820 is an abundant number, since it is smaller than the sum of its proper divisors (1241129340).

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

684842820 is a wasteful number, since it uses less digits than its factorization.

684842820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50084 (or 50082 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 42.

The square root of 684842820 is about 26169.5017147824. The cubic root of 684842820 is about 881.4485526154.

The spelling of 684842820 in words is "six hundred eighty-four million, eight hundred forty-two thousand, eight hundred twenty".