684016906 has 4 divisors (see below), whose sum is σ = 1026025362. Its totient is φ = 342008452.

The previous prime is 684016901. The next prime is 684016909. The reversal of 684016906 is 609610486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609610486 = 2 ⋅304805243.

It can be written as a sum of positive squares in only one way, i.e., 622253025 + 61763881 = 24945^2 + 7859^2 .

It is not an unprimeable number, because it can be changed into a prime (684016901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171004225 + ... + 171004228.

Almost surely, 2^684016906 is an apocalyptic number.

684016906 is a deficient number, since it is larger than the sum of its proper divisors (342008456).

684016906 is a wasteful number, since it uses less digits than its factorization.

684016906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342008455.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 684016906 is about 26153.7168677800. The cubic root of 684016906 is about 881.0940705217.

The spelling of 684016906 in words is "six hundred eighty-four million, sixteen thousand, nine hundred six".