638632733027 has 4 divisors (see below), whose sum is σ = 638634417360. Its totient is φ = 638631048696.

The previous prime is 638632733023. The next prime is 638632733047. The reversal of 638632733027 is 720337236836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638632733027 - 2² = 638632733023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638632733023) 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 3 ways as a sum of consecutive naturals, for example, 22493 + ... + 1130385.

It is an arithmetic number, because the mean of its divisors is an integer number (159658604340).

Almost surely, 2^638632733027 is an apocalyptic number.

638632733027 is a deficient number, since it is larger than the sum of its proper divisors (1684333).

638632733027 is a wasteful number, since it uses less digits than its factorization.

638632733027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684332.

The product of its (nonzero) digits is 4572288, while the sum is 50.

The spelling of 638632733027 in words is "six hundred thirty-eight billion, six hundred thirty-two million, seven hundred thirty-three thousand, twenty-seven".