646004306 has 4 divisors (see below), whose sum is σ = 969006462. Its totient is φ = 323002152.

The previous prime is 646004299. The next prime is 646004309. The reversal of 646004306 is 603400646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 603400646 = 2 ⋅301700323.

It can be written as a sum of positive squares in only one way, i.e., 472845025 + 173159281 = 21745^2 + 13159^2 .

It is not an unprimeable number, because it can be changed into a prime (646004309) by changing a digit.

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, 161501075 + ... + 161501078.

Almost surely, 2^646004306 is an apocalyptic number.

646004306 is a deficient number, since it is larger than the sum of its proper divisors (323002156).

646004306 is a wasteful number, since it uses less digits than its factorization.

646004306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323002155.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 646004306 is about 25416.6147627885. The cubic root of 646004306 is about 864.4604678921.

The spelling of 646004306 in words is "six hundred forty-six million, four thousand, three hundred six".