638890964226 has 24 divisors (see below), whose sum is σ = 1387878036480. Its totient is φ = 212407611576.

The previous prime is 638890964219. The next prime is 638890964227. The reversal of 638890964226 is 622469098836.

638890964226 is a `hidden beast` number, since 6 + 38 + 8 + 90 + 96 + 422 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (638890964227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46329846 + ... + 46343633.

It is an arithmetic number, because the mean of its divisors is an integer number (57828251520).

Almost surely, 2^638890964226 is an apocalyptic number.

638890964226 is an abundant number, since it is smaller than the sum of its proper divisors (748987072254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638890964226 is a wasteful number, since it uses less digits than its factorization.

638890964226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92673870 (or 92673867 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 63.

The spelling of 638890964226 in words is "six hundred thirty-eight billion, eight hundred ninety million, nine hundred sixty-four thousand, two hundred twenty-six".