638526473 has 16 divisors (see below), whose sum is σ = 694411200. Its totient is φ = 583640640.

The previous prime is 638526433. The next prime is 638526491. The reversal of 638526473 is 374625836.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638526473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638526433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769823 + ... + 770651.

It is an arithmetic number, because the mean of its divisors is an integer number (43400700).

Almost surely, 2^638526473 is an apocalyptic number.

It is an amenable number.

638526473 is a deficient number, since it is larger than the sum of its proper divisors (55884727).

638526473 is a wasteful number, since it uses less digits than its factorization.

638526473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352.

The product of its digits is 725760, while the sum is 44.

The square root of 638526473 is about 25269.0813643868. The cubic root of 638526473 is about 861.1119890950. Note that the first 3 decimals are identical.

The spelling of 638526473 in words is "six hundred thirty-eight million, five hundred twenty-six thousand, four hundred seventy-three".