643543710 has 64 divisors (see below), whose sum is σ = 1573731072. Its totient is φ = 168385536.

The previous prime is 643543697. The next prime is 643543741. The reversal of 643543710 is 17345346.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 709077 + ... + 709983.

It is an arithmetic number, because the mean of its divisors is an integer number (24589548).

Almost surely, 2^643543710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643543710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786865536).

643543710 is an abundant number, since it is smaller than the sum of its proper divisors (930187362).

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

643543710 is a wasteful number, since it uses less digits than its factorization.

643543710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 643543710 is about 25368.1633154629. The cubic root of 643543710 is about 863.3615101226.

The spelling of 643543710 in words is "six hundred forty-three million, five hundred forty-three thousand, seven hundred ten".