684319676820 has 48 divisors (see below), whose sum is σ = 2063487027840. Its totient is φ = 168447920256.

The previous prime is 684319676819. The next prime is 684319676839. The reversal of 684319676820 is 28676913486.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438665680 + ... + 438667239.

It is an arithmetic number, because the mean of its divisors is an integer number (42989313080).

Almost surely, 2^684319676820 is an apocalyptic number.

684319676820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684319676820 is an abundant number, since it is smaller than the sum of its proper divisors (1379167351020).

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

684319676820 is a wasteful number, since it uses less digits than its factorization.

684319676820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877332944 (or 877332942 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 60.

The spelling of 684319676820 in words is "six hundred eighty-four billion, three hundred nineteen million, six hundred seventy-six thousand, eight hundred twenty".