638844677627 has 8 divisors (see below), whose sum is σ = 717899036064. Its totient is φ = 564063527808.

The previous prime is 638844677621. The next prime is 638844677629. The reversal of 638844677627 is 726776448836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638844677627 - 2⁶ = 638844677563 is a prime.

It is a super-2 number, since 2×638844677627² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638844677621) by changing a digit.

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, 1068301838 + ... + 1068302435.

It is an arithmetic number, because the mean of its divisors is an integer number (89737379508).

Almost surely, 2^638844677627 is an apocalyptic number.

638844677627 is a deficient number, since it is larger than the sum of its proper divisors (79054358437).

638844677627 is a wasteful number, since it uses less digits than its factorization.

638844677627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136604309.

The product of its digits is 455196672, while the sum is 68.

The spelling of 638844677627 in words is "six hundred thirty-eight billion, eight hundred forty-four million, six hundred seventy-seven thousand, six hundred twenty-seven".