63138638 has 4 divisors (see below), whose sum is σ = 94707960. Its totient is φ = 31569318.

The previous prime is 63138631. The next prime is 63138671. The reversal of 63138638 is 83683136.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63138631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15784658 + ... + 15784661.

It is an arithmetic number, because the mean of its divisors is an integer number (23676990).

Almost surely, 2^63138638 is an apocalyptic number.

63138638 is a deficient number, since it is larger than the sum of its proper divisors (31569322).

63138638 is a wasteful number, since it uses less digits than its factorization.

63138638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31569321.

The product of its digits is 62208, while the sum is 38.

The square root of 63138638 is about 7945.9825069025. The cubic root of 63138638 is about 398.1973844796.

The spelling of 63138638 in words is "sixty-three million, one hundred thirty-eight thousand, six hundred thirty-eight".