646949804 has 6 divisors (see below), whose sum is σ = 1132162164. Its totient is φ = 323474900.

The previous prime is 646949803. The next prime is 646949813. The reversal of 646949804 is 408949646.

It is not an unprimeable number, because it can be changed into a prime (646949801) by changing a digit.

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 as a sum of consecutive naturals, namely, 80868722 + ... + 80868729.

It is an arithmetic number, because the mean of its divisors is an integer number (188693694).

Almost surely, 2^646949804 is an apocalyptic number.

It is an amenable number.

646949804 is a deficient number, since it is larger than the sum of its proper divisors (485212360).

646949804 is a wasteful number, since it uses less digits than its factorization.

646949804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161737455 (or 161737453 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 50.

The square root of 646949804 is about 25435.2079606203. The cubic root of 646949804 is about 864.8820064699.

The spelling of 646949804 in words is "six hundred forty-six million, nine hundred forty-nine thousand, eight hundred four".