643681302 has 32 divisors (see below), whose sum is σ = 1487009664. Its totient is φ = 183580800.

The previous prime is 643681279. The next prime is 643681397. The reversal of 643681302 is 203186346.

643681302 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285724 + ... + 287967.

It is an arithmetic number, because the mean of its divisors is an integer number (46469052).

Almost surely, 2^643681302 is an apocalyptic number.

643681302 is an abundant number, since it is smaller than the sum of its proper divisors (843328362).

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

643681302 is a wasteful number, since it uses less digits than its factorization.

643681302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573724.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 643681302 is about 25370.8750735957. The cubic root of 643681302 is about 863.4230356880.

The spelling of 643681302 in words is "six hundred forty-three million, six hundred eighty-one thousand, three hundred two".