638634278482 has 16 divisors (see below), whose sum is σ = 965548846080. Its totient is φ = 316784947248.

The previous prime is 638634278441. The next prime is 638634278483. The reversal of 638634278482 is 284872436836.

It is a self number, because there is not a number n which added to its sum of digits gives 638634278482.

It is not an unprimeable number, because it can be changed into a prime (638634278483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5209144 + ... + 5330332.

It is an arithmetic number, because the mean of its divisors is an integer number (60346802880).

Almost surely, 2^638634278482 is an apocalyptic number.

638634278482 is a deficient number, since it is larger than the sum of its proper divisors (326914567598).

638634278482 is a wasteful number, since it uses less digits than its factorization.

638634278482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142065.

The product of its digits is 74317824, while the sum is 61.

The spelling of 638634278482 in words is "six hundred thirty-eight billion, six hundred thirty-four million, two hundred seventy-eight thousand, four hundred eighty-two".