684845140 has 48 divisors (see below), whose sum is σ = 1683730944. Its totient is φ = 229075200.

The previous prime is 684845137. The next prime is 684845243. The reversal of 684845140 is 41548486.

It is a junction number, because it is equal to n+sod(n) for n = 684845093 and 684845102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53916 + ... + 65395.

It is an arithmetic number, because the mean of its divisors is an integer number (35077728).

Almost surely, 2^684845140 is an apocalyptic number.

It is an amenable number.

684845140 is an abundant number, since it is smaller than the sum of its proper divisors (998885804).

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

684845140 is a wasteful number, since it uses less digits than its factorization.

684845140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119368 (or 119366 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The square root of 684845140 is about 26169.5460411525. The cubic root of 684845140 is about 881.4495479574.

The spelling of 684845140 in words is "six hundred eighty-four million, eight hundred forty-five thousand, one hundred forty".