684316505 has 8 divisors (see below), whose sum is σ = 821332872. Its totient is φ = 547351168.

The previous prime is 684316499. The next prime is 684316553. The reversal of 684316505 is 505613486.

It can be written as a sum of positive squares in 4 ways, for example, as 209207296 + 475109209 = 14464^2 + 21797^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684316505 - 2⁴ = 684316489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29447 + ... + 47283.

It is an arithmetic number, because the mean of its divisors is an integer number (102666609).

Almost surely, 2^684316505 is an apocalyptic number.

It is an amenable number.

684316505 is a deficient number, since it is larger than the sum of its proper divisors (137016367).

684316505 is a wasteful number, since it uses less digits than its factorization.

684316505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25515.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 684316505 is about 26159.4438969944. The cubic root of 684316505 is about 881.2226913054. Note that the first 3 decimals are identical.

The spelling of 684316505 in words is "six hundred eighty-four million, three hundred sixteen thousand, five hundred five".