638091384472 has 16 divisors (see below), whose sum is σ = 1196463537000. Its totient is φ = 319034441280.

The previous prime is 638091384467. The next prime is 638091384487. The reversal of 638091384472 is 274483190836.

It is a super-2 number, since 2×638091384472² (a number of 24 digits) contains 22 as substring.

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, 1162854 + ... + 1621237.

Almost surely, 2^638091384472 is an apocalyptic number.

It is an amenable number.

638091384472 is a deficient number, since it is larger than the sum of its proper divisors (558372152528).

638091384472 is a wasteful number, since it uses less digits than its factorization.

638091384472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812746 (or 2812742 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 638091384472 in words is "six hundred thirty-eight billion, ninety-one million, three hundred eighty-four thousand, four hundred seventy-two".