684688053450 has 96 divisors (see below), whose sum is σ = 1804907764224. Its totient is φ = 171174461440.

The previous prime is 684688053437. The next prime is 684688053451. The reversal of 684688053450 is 54350886486.

It is not an unprimeable number, because it can be changed into a prime (684688053451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132967 + ... + 1177733.

It is an arithmetic number, because the mean of its divisors is an integer number (18801122544).

Almost surely, 2^684688053450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684688053450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902453882112).

684688053450 is an abundant number, since it is smaller than the sum of its proper divisors (1120219710774).

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

684688053450 is a wasteful number, since it uses less digits than its factorization.

684688053450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045056 (or 1045051 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 57.

The spelling of 684688053450 in words is "six hundred eighty-four billion, six hundred eighty-eight million, fifty-three thousand, four hundred fifty".