638462227783 has 4 divisors (see below), whose sum is σ = 638491018608. Its totient is φ = 638433436960.

The previous prime is 638462227771. The next prime is 638462227787. The reversal of 638462227783 is 387722264836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638462227783 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638462227787) 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, 14362123 + ... + 14406508.

It is an arithmetic number, because the mean of its divisors is an integer number (159622754652).

Almost surely, 2^638462227783 is an apocalyptic number.

638462227783 is a deficient number, since it is larger than the sum of its proper divisors (28790825).

638462227783 is a wasteful number, since it uses less digits than its factorization.

638462227783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28790824.

The product of its digits is 32514048, while the sum is 58.

The spelling of 638462227783 in words is "six hundred thirty-eight billion, four hundred sixty-two million, two hundred twenty-seven thousand, seven hundred eighty-three".