638527967 has 12 divisors (see below), whose sum is σ = 810303336. Its totient is φ = 497553840.

The previous prime is 638527961. The next prime is 638527979. The reversal of 638527967 is 769725836.

It is not a de Polignac number, because 638527967 - 2⁴ = 638527951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638527961) 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, 591788 + ... + 592865.

It is an arithmetic number, because the mean of its divisors is an integer number (67525278).

Almost surely, 2^638527967 is an apocalyptic number.

638527967 is a deficient number, since it is larger than the sum of its proper divisors (171775369).

638527967 is a wasteful number, since it uses less digits than its factorization.

638527967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184678 (or 1184671 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 53.

The square root of 638527967 is about 25269.1109261881. The cubic root of 638527967 is about 861.1126606936.

The spelling of 638527967 in words is "six hundred thirty-eight million, five hundred twenty-seven thousand, nine hundred sixty-seven".