638330061 has 16 divisors (see below), whose sum is σ = 896509440. Its totient is φ = 402882480.

The previous prime is 638330053. The next prime is 638330081. The reversal of 638330061 is 160033836.

It is not a de Polignac number, because 638330061 - 2³ = 638330053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638330041) 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, 111376 + ... + 116966.

It is an arithmetic number, because the mean of its divisors is an integer number (56031840).

Almost surely, 2^638330061 is an apocalyptic number.

It is an amenable number.

638330061 is a deficient number, since it is larger than the sum of its proper divisors (258179379).

638330061 is a wasteful number, since it uses less digits than its factorization.

638330061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7616.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 638330061 is about 25265.1946558898. The cubic root of 638330061 is about 861.0236867928.

Adding to 638330061 its reverse (160033836), we get a palindrome (798363897).

The spelling of 638330061 in words is "six hundred thirty-eight million, three hundred thirty thousand, sixty-one".