638036996 has 24 divisors (see below), whose sum is σ = 1183021056. Its totient is φ = 300055680.

The previous prime is 638036981. The next prime is 638037007. The reversal of 638036996 is 699630836.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 186461 + ... + 189851.

It is an arithmetic number, because the mean of its divisors is an integer number (49292544).

Almost surely, 2^638036996 is an apocalyptic number.

It is an amenable number.

638036996 is a deficient number, since it is larger than the sum of its proper divisors (544984060).

638036996 is a wasteful number, since it uses less digits than its factorization.

638036996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179 (or 6177 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 50.

The square root of 638036996 is about 25259.3942128468. The cubic root of 638036996 is about 860.8918978491.

The spelling of 638036996 in words is "six hundred thirty-eight million, thirty-six thousand, nine hundred ninety-six".