684701305 has 4 divisors (see below), whose sum is σ = 821641572. Its totient is φ = 547761040.

The previous prime is 684701291. The next prime is 684701327. The reversal of 684701305 is 503107486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 264615289 + 420086016 = 16267^2 + 20496^2 .

It is not a de Polignac number, because 684701305 - 2⁵ = 684701273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68470126 + ... + 68470135.

It is an arithmetic number, because the mean of its divisors is an integer number (205410393).

Almost surely, 2^684701305 is an apocalyptic number.

It is an amenable number.

684701305 is a deficient number, since it is larger than the sum of its proper divisors (136940267).

684701305 is a wasteful number, since it uses less digits than its factorization.

684701305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136940266.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 684701305 is about 26166.7977597565. The cubic root of 684701305 is about 881.3878346515.

The spelling of 684701305 in words is "six hundred eighty-four million, seven hundred one thousand, three hundred five".