638887631882 has 16 divisors (see below), whose sum is σ = 963853424352. Its totient is φ = 317603990160.

The previous prime is 638887631869. The next prime is 638887631897. The reversal of 638887631882 is 288136788836.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344413 + ... + 1756479.

It is an arithmetic number, because the mean of its divisors is an integer number (60240839022).

Almost surely, 2^638887631882 is an apocalyptic number.

638887631882 is a deficient number, since it is larger than the sum of its proper divisors (324965792470).

638887631882 is a wasteful number, since it uses less digits than its factorization.

638887631882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416533.

The product of its digits is 148635648, while the sum is 68.

The spelling of 638887631882 in words is "six hundred thirty-eight billion, eight hundred eighty-seven million, six hundred thirty-one thousand, eight hundred eighty-two".