646304263 has 4 divisors (see below), whose sum is σ = 705059208. Its totient is φ = 587549320.

The previous prime is 646304261. The next prime is 646304287. The reversal of 646304263 is 362403646.

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

It is a cyclic number.

It is not a de Polignac number, because 646304263 - 2¹ = 646304261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646304261) 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 in 3 ways as a sum of consecutive naturals, for example, 29377456 + ... + 29377477.

It is an arithmetic number, because the mean of its divisors is an integer number (176264802).

Almost surely, 2^646304263 is an apocalyptic number.

646304263 is a deficient number, since it is larger than the sum of its proper divisors (58754945).

646304263 is a wasteful number, since it uses less digits than its factorization.

646304263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58754944.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 646304263 is about 25422.5148834650. The cubic root of 646304263 is about 864.5942445265.

The spelling of 646304263 in words is "six hundred forty-six million, three hundred four thousand, two hundred sixty-three".