684840082 has 4 divisors (see below), whose sum is σ = 1027260126. Its totient is φ = 342420040.

The previous prime is 684840077. The next prime is 684840103. The reversal of 684840082 is 280048486.

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

It can be written as a sum of positive squares in only one way, i.e., 639128961 + 45711121 = 25281^2 + 6761^2 .

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 as a sum of consecutive naturals, namely, 171210019 + ... + 171210022.

Almost surely, 2^684840082 is an apocalyptic number.

684840082 is a deficient number, since it is larger than the sum of its proper divisors (342420044).

684840082 is a wasteful number, since it uses less digits than its factorization.

684840082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342420043.

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 684840082 is about 26169.4494019267. The cubic root of 684840082 is about 881.4473779374.

The spelling of 684840082 in words is "six hundred eighty-four million, eight hundred forty thousand, eighty-two".