643126760 has 16 divisors (see below), whose sum is σ = 1447035300. Its totient is φ = 257250688.

The previous prime is 643126741. The next prime is 643126777. The reversal of 643126760 is 67621346.

643126760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 643028164 + 98596 = 25358^2 + 314^2 .

It is a super-2 number, since 2×643126760² = 827224058856195200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643126760.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8039045 + ... + 8039124.

Almost surely, 2^643126760 is an apocalyptic number.

It is an amenable number.

643126760 is an abundant number, since it is smaller than the sum of its proper divisors (803908540).

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

643126760 is a wasteful number, since it uses less digits than its factorization.

643126760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16078180 (or 16078176 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 643126760 is about 25359.9440062473. The cubic root of 643126760 is about 863.1750134133.

The spelling of 643126760 in words is "six hundred forty-three million, one hundred twenty-six thousand, seven hundred sixty".