638842770534 has 16 divisors (see below), whose sum is σ = 1352843514288. Its totient is φ = 200421261312.

The previous prime is 638842770529. The next prime is 638842770583. The reversal of 638842770534 is 435077248836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3131582107 + ... + 3131582310.

It is an arithmetic number, because the mean of its divisors is an integer number (84552719643).

Almost surely, 2^638842770534 is an apocalyptic number.

638842770534 is an abundant number, since it is smaller than the sum of its proper divisors (714000743754).

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

638842770534 is a wasteful number, since it uses less digits than its factorization.

638842770534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6263164439.

The product of its (nonzero) digits is 27095040, while the sum is 57.

The spelling of 638842770534 in words is "six hundred thirty-eight billion, eight hundred forty-two million, seven hundred seventy thousand, five hundred thirty-four".