643646036 has 12 divisors (see below), whose sum is σ = 1228778880. Its totient is φ = 292566360.

The previous prime is 643646021. The next prime is 643646041. The reversal of 643646036 is 630646346.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 7314116 + ... + 7314203.

It is an arithmetic number, because the mean of its divisors is an integer number (102398240).

Almost surely, 2^643646036 is an apocalyptic number.

It is an amenable number.

643646036 is a deficient number, since it is larger than the sum of its proper divisors (585132844).

643646036 is a wasteful number, since it uses less digits than its factorization.

643646036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14628334 (or 14628332 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 38.

The square root of 643646036 is about 25370.1800545444. The cubic root of 643646036 is about 863.4072669979.

The spelling of 643646036 in words is "six hundred forty-three million, six hundred forty-six thousand, thirty-six".