638262812 has 24 divisors (see below), whose sum is σ = 1222445952. Its totient is φ = 289180400.

The previous prime is 638262799. The next prime is 638262847. The reversal of 638262812 is 218262836.

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 7 ways as a sum of consecutive naturals, for example, 9638 + ... + 37005.

It is an arithmetic number, because the mean of its divisors is an integer number (50935248).

Almost surely, 2^638262812 is an apocalyptic number.

It is an amenable number.

638262812 is a deficient number, since it is larger than the sum of its proper divisors (584183140).

638262812 is a wasteful number, since it uses less digits than its factorization.

638262812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46969 (or 46967 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 638262812 is about 25263.8637583407. The cubic root of 638262812 is about 860.9934490318.

The spelling of 638262812 in words is "six hundred thirty-eight million, two hundred sixty-two thousand, eight hundred twelve".