684204266 has 4 divisors (see below), whose sum is σ = 1026306402. Its totient is φ = 342102132.

The previous prime is 684204263. The next prime is 684204271. The reversal of 684204266 is 662402486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662402486 = 2 ⋅331201243.

It can be written as a sum of positive squares in only one way, i.e., 577681225 + 106523041 = 24035^2 + 10321^2 .

It is a super-2 number, since 2×684204266² = 936270955225197512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684204263) 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, 171051065 + ... + 171051068.

Almost surely, 2^684204266 is an apocalyptic number.

684204266 is a deficient number, since it is larger than the sum of its proper divisors (342102136).

684204266 is a wasteful number, since it uses less digits than its factorization.

684204266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342102135.

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 684204266 is about 26157.2985225921. The cubic root of 684204266 is about 881.1745104023.

The spelling of 684204266 in words is "six hundred eighty-four million, two hundred four thousand, two hundred sixty-six".