638436696 has 16 divisors (see below), whose sum is σ = 1596091800. Its totient is φ = 212812224.

The previous prime is 638436677. The next prime is 638436709. The reversal of 638436696 is 696634836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13300741 + ... + 13300788.

Almost surely, 2^638436696 is an apocalyptic number.

It is an amenable number.

638436696 is an abundant number, since it is smaller than the sum of its proper divisors (957655104).

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

638436696 is a wasteful number, since it uses less digits than its factorization.

638436696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26601538 (or 26601534 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 51.

The square root of 638436696 is about 25267.3048820012. The cubic root of 638436696 is about 861.0716296749.

The spelling of 638436696 in words is "six hundred thirty-eight million, four hundred thirty-six thousand, six hundred ninety-six".