638919648782 has 8 divisors (see below), whose sum is σ = 959052969696. Its totient is φ = 319235325552.

The previous prime is 638919648761. The next prime is 638919648799. The reversal of 638919648782 is 287846919836.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112245863 + ... + 112251554.

It is an arithmetic number, because the mean of its divisors is an integer number (119881621212).

Almost surely, 2^638919648782 is an apocalyptic number.

638919648782 is a deficient number, since it is larger than the sum of its proper divisors (320133320914).

638919648782 is a wasteful number, since it uses less digits than its factorization.

638919648782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224498842.

The product of its digits is 250822656, while the sum is 71.

The spelling of 638919648782 in words is "six hundred thirty-eight billion, nine hundred nineteen million, six hundred forty-eight thousand, seven hundred eighty-two".