638030643 has 16 divisors (see below), whose sum is σ = 876355200. Its totient is φ = 412646720.

The previous prime is 638030633. The next prime is 638030663. The reversal of 638030643 is 346030836.

It is a cyclic number.

It is not a de Polignac number, because 638030643 - 2⁶ = 638030579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638030633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7528 + ... + 36506.

It is an arithmetic number, because the mean of its divisors is an integer number (54772200).

Almost surely, 2^638030643 is an apocalyptic number.

638030643 is a deficient number, since it is larger than the sum of its proper divisors (238324557).

638030643 is a wasteful number, since it uses less digits than its factorization.

638030643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29202.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 638030643 is about 25259.2684573406. The cubic root of 638030643 is about 860.8890405099.

The spelling of 638030643 in words is "six hundred thirty-eight million, thirty thousand, six hundred forty-three".