638884630467 has 128 divisors (see below), whose sum is σ = 1062791331840. Its totient is φ = 377213760000.

The previous prime is 638884630457. The next prime is 638884630519. The reversal of 638884630467 is 764036488836.

638884630467 is a `hidden beast` number, since 6 + 38 + 8 + 84 + 63 + 0 + 467 = 666.

It is not a de Polignac number, because 638884630467 - 2⁴ = 638884630451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638884630457) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 607882092 + ... + 607883142.

It is an arithmetic number, because the mean of its divisors is an integer number (8303057280).

Almost surely, 2^638884630467 is an apocalyptic number.

638884630467 is a deficient number, since it is larger than the sum of its proper divisors (423906701373).

638884630467 is a wasteful number, since it uses less digits than its factorization.

638884630467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982 (or 1976 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 63.

The spelling of 638884630467 in words is "six hundred thirty-eight billion, eight hundred eighty-four million, six hundred thirty thousand, four hundred sixty-seven".