638555534 has 16 divisors (see below), whose sum is σ = 1008758400. Its totient is φ = 302319864.

The previous prime is 638555521. The next prime is 638555537. The reversal of 638555534 is 435555836.

638555534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638555537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113807 + ... + 119285.

It is an arithmetic number, because the mean of its divisors is an integer number (63047400).

Almost surely, 2^638555534 is an apocalyptic number.

638555534 is a deficient number, since it is larger than the sum of its proper divisors (370202866).

638555534 is a wasteful number, since it uses less digits than its factorization.

638555534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8567.

The product of its digits is 1080000, while the sum is 44.

The square root of 638555534 is about 25269.6563886413. The cubic root of 638555534 is about 861.1250527120.

The spelling of 638555534 in words is "six hundred thirty-eight million, five hundred fifty-five thousand, five hundred thirty-four".