684914305 has 4 divisors (see below), whose sum is σ = 821897172. Its totient is φ = 547931440.

The previous prime is 684914281. The next prime is 684914327. The reversal of 684914305 is 503419486.

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 195664144 + 489250161 = 13988^2 + 22119^2 .

It is not a de Polignac number, because 684914305 - 2¹³ = 684906113 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, 68491426 + ... + 68491435.

It is an arithmetic number, because the mean of its divisors is an integer number (205474293).

Almost surely, 2^684914305 is an apocalyptic number.

It is an amenable number.

684914305 is a deficient number, since it is larger than the sum of its proper divisors (136982867).

684914305 is a wasteful number, since it uses less digits than its factorization.

684914305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136982866.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 684914305 is about 26170.8674865775. The cubic root of 684914305 is about 881.4792205564.

The spelling of 684914305 in words is "six hundred eighty-four million, nine hundred fourteen thousand, three hundred five".