646863830 has 16 divisors (see below), whose sum is σ = 1164696624. Its totient is φ = 258669600.

The previous prime is 646863829. The next prime is 646863851. The reversal of 646863830 is 38368646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37244 + ... + 51776.

It is an arithmetic number, because the mean of its divisors is an integer number (72793539).

Almost surely, 2^646863830 is an apocalyptic number.

646863830 is a deficient number, since it is larger than the sum of its proper divisors (517832794).

646863830 is a wasteful number, since it uses less digits than its factorization.

646863830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18991.

The product of its (nonzero) digits is 497664, while the sum is 44.

The square root of 646863830 is about 25433.5178455518. The cubic root of 646863830 is about 864.8436930082.

The spelling of 646863830 in words is "six hundred forty-six million, eight hundred sixty-three thousand, eight hundred thirty".