684000371780 has 96 divisors (see below), whose sum is σ = 1574432657280. Its totient is φ = 247547520000.

The previous prime is 684000371759. The next prime is 684000371797. The reversal of 684000371780 is 87173000486.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43757006 + ... + 43772634.

It is an arithmetic number, because the mean of its divisors is an integer number (16400340180).

Almost surely, 2^684000371780 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 684000371780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787216328640).

684000371780 is an abundant number, since it is smaller than the sum of its proper divisors (890432285500).

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

684000371780 is a wasteful number, since it uses less digits than its factorization.

684000371780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16581 (or 16579 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 684000371780 in words is "six hundred eighty-four billion, three hundred seventy-one thousand, seven hundred eighty".