643725010 has 16 divisors (see below), whose sum is σ = 1186966872. Its totient is φ = 251209600.

The previous prime is 643724981. The next prime is 643725029. The reversal of 643725010 is 10527346.

It can be written as a sum of positive squares in 4 ways, for example, as 446519161 + 197205849 = 21131^2 + 14043^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 643725010.

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 7 ways as a sum of consecutive naturals, for example, 784621 + ... + 785440.

Almost surely, 2^643725010 is an apocalyptic number.

643725010 is a deficient number, since it is larger than the sum of its proper divisors (543241862).

643725010 is a wasteful number, since it uses less digits than its factorization.

643725010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570109.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 643725010 is about 25371.7364403779. The cubic root of 643725010 is about 863.4425782990.

The spelling of 643725010 in words is "six hundred forty-three million, seven hundred twenty-five thousand, ten".