646420304 has 20 divisors (see below), whose sum is σ = 1258934676. Its totient is φ = 321533952.

The previous prime is 646420289. The next prime is 646420321. The reversal of 646420304 is 403024646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 454542400 + 191877904 = 21320^2 + 13852^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101579 + ... + 107754.

Almost surely, 2^646420304 is an apocalyptic number.

It is an amenable number.

646420304 is a deficient number, since it is larger than the sum of its proper divisors (612514372).

646420304 is a wasteful number, since it uses less digits than its factorization.

646420304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209534 (or 209528 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 646420304 is about 25424.7970296716. The cubic root of 646420304 is about 864.6459860888.

The spelling of 646420304 in words is "six hundred forty-six million, four hundred twenty thousand, three hundred four".