638030641 has 8 divisors (see below), whose sum is σ = 640343880. Its totient is φ = 635722752.

The previous prime is 638030633. The next prime is 638030663. The reversal of 638030641 is 146030836.

It can be written as a sum of positive squares in 4 ways, for example, as 16974400 + 621056241 = 4120^2 + 24921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638030641 - 2³ = 638030633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638030941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564565 + ... + 565693.

It is an arithmetic number, because the mean of its divisors is an integer number (80042985).

Almost surely, 2^638030641 is an apocalyptic number.

It is an amenable number.

638030641 is a deficient number, since it is larger than the sum of its proper divisors (2313239).

638030641 is a wasteful number, since it uses less digits than its factorization.

638030641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 638030641 is about 25259.2684177511. The cubic root of 638030641 is about 860.8890396103.

The spelling of 638030641 in words is "six hundred thirty-eight million, thirty thousand, six hundred forty-one".