643040030 has 16 divisors (see below), whose sum is σ = 1157775120. Its totient is φ = 257148672.

The previous prime is 643040029. The next prime is 643040039. The reversal of 643040030 is 30040346.

It is a happy number.

643040030 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 643039984 and 643040011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643040039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53081 + ... + 64059.

It is an arithmetic number, because the mean of its divisors is an integer number (72360945).

Almost surely, 2^643040030 is an apocalyptic number.

643040030 is a deficient number, since it is larger than the sum of its proper divisors (514735090).

643040030 is a wasteful number, since it uses less digits than its factorization.

643040030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16843.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 643040030 is about 25358.2339684766. The cubic root of 643040030 is about 863.1362100031.

Adding to 643040030 its reverse (30040346), we get a palindrome (673080376).

The spelling of 643040030 in words is "six hundred forty-three million, forty thousand, thirty".