643649200 has 60 divisors (see below), whose sum is σ = 1599719040. Its totient is φ = 248577280.

The previous prime is 643649179. The next prime is 643649221. The reversal of 643649200 is 2946346.

643649200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (643649179) and next prime (643649221).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16144 + ... + 39343.

It is an arithmetic number, because the mean of its divisors is an integer number (26661984).

Almost surely, 2^643649200 is an apocalyptic number.

It is an amenable number.

643649200 is an abundant number, since it is smaller than the sum of its proper divisors (956069840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643649200 is a wasteful number, since it uses less digits than its factorization.

643649200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55534 (or 55523 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 643649200 is about 25370.2424111399. The cubic root of 643649200 is about 863.4086817590.

The spelling of 643649200 in words is "six hundred forty-three million, six hundred forty-nine thousand, two hundred".