638120098 has 16 divisors (see below), whose sum is σ = 1193367744. Its totient is φ = 248618160.

The previous prime is 638120071. The next prime is 638120099. The reversal of 638120098 is 890021836.

It is not an unprimeable number, because it can be changed into a prime (638120099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2071665 + ... + 2071972.

It is an arithmetic number, because the mean of its divisors is an integer number (74585484).

Almost surely, 2^638120098 is an apocalyptic number.

638120098 is a deficient number, since it is larger than the sum of its proper divisors (555247646).

638120098 is a wasteful number, since it uses less digits than its factorization.

638120098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143657.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 638120098 is about 25261.0391314372. The cubic root of 638120098 is about 860.9292722402.

The spelling of 638120098 in words is "six hundred thirty-eight million, one hundred twenty thousand, ninety-eight".