684616536 has 96 divisors (see below), whose sum is σ = 1946468160. Its totient is φ = 225402912.

The previous prime is 684616507. The next prime is 684616547. The reversal of 684616536 is 635616486.

684616536 is a `hidden beast` number, since 68 + 46 + 16 + 536 = 666.

684616536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 684616491 and 684616500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159231 + ... + 163473.

It is an arithmetic number, because the mean of its divisors is an integer number (20275710).

Almost surely, 2^684616536 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 684616536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973234080).

684616536 is an abundant number, since it is smaller than the sum of its proper divisors (1261851624).

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

684616536 is a wasteful number, since it uses less digits than its factorization.

684616536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347 (or 4331 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 684616536 is about 26165.1779279255. The cubic root of 684616536 is about 881.3514599344.

Subtracting from 684616536 its reverse (635616486), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 684616536 in words is "six hundred eighty-four million, six hundred sixteen thousand, five hundred thirty-six".