638603742 has 32 divisors (see below), whose sum is σ = 1545530112. Its totient is φ = 171725184.

The previous prime is 638603681. The next prime is 638603761. The reversal of 638603742 is 247306836.

It is a self number, because there is not a number n which added to its sum of digits gives 638603742.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446488 + ... + 447915.

It is an arithmetic number, because the mean of its divisors is an integer number (48297816).

Almost surely, 2^638603742 is an apocalyptic number.

638603742 is an abundant number, since it is smaller than the sum of its proper divisors (906926370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638603742 is a wasteful number, since it uses less digits than its factorization.

638603742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894432.

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 638603742 is about 25270.6102419392. The cubic root of 638603742 is about 861.1467224910.

The spelling of 638603742 in words is "six hundred thirty-eight million, six hundred three thousand, seven hundred forty-two".