638840741474 has 32 divisors (see below), whose sum is σ = 1065375607296. Its totient is φ = 285308127360.

The previous prime is 638840741471. The next prime is 638840741489. The reversal of 638840741474 is 474147048836.

It is not an unprimeable number, because it can be changed into a prime (638840741471) 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 15 ways as a sum of consecutive naturals, for example, 8722334 + ... + 8795270.

It is an arithmetic number, because the mean of its divisors is an integer number (33292987728).

Almost surely, 2^638840741474 is an apocalyptic number.

638840741474 is a deficient number, since it is larger than the sum of its proper divisors (426534865822).

638840741474 is a wasteful number, since it uses less digits than its factorization.

638840741474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83850.

The product of its (nonzero) digits is 14450688, while the sum is 56.

The spelling of 638840741474 in words is "six hundred thirty-eight billion, eight hundred forty million, seven hundred forty-one thousand, four hundred seventy-four".