638674788047 has 8 divisors (see below), whose sum is σ = 650738159856. Its totient is φ = 626611894272.

The previous prime is 638674788029. The next prime is 638674788119. The reversal of 638674788047 is 740887476836.

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 638674788047 - 2⁶ = 638674787983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638674758047) 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, 3748943 + ... + 3915599.

It is an arithmetic number, because the mean of its divisors is an integer number (81342269982).

Almost surely, 2^638674788047 is an apocalyptic number.

638674788047 is a deficient number, since it is larger than the sum of its proper divisors (12063371809).

638674788047 is a wasteful number, since it uses less digits than its factorization.

638674788047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239017.

The product of its (nonzero) digits is 303464448, while the sum is 68.

The spelling of 638674788047 in words is "six hundred thirty-eight billion, six hundred seventy-four million, seven hundred eighty-eight thousand, forty-seven".