638764011 has 12 divisors (see below), whose sum is σ = 944116888. Its totient is φ = 415939104.

The previous prime is 638763973. The next prime is 638764037. The reversal of 638764011 is 110467836.

638764011 is a `hidden beast` number, since 6 + 3 + 8 + 7 + 640 + 1 + 1 = 666.

638764011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638764011 - 2¹⁰ = 638762987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638764081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 824890 + ... + 825663.

Almost surely, 2^638764011 is an apocalyptic number.

638764011 is a deficient number, since it is larger than the sum of its proper divisors (305352877).

638764011 is a wasteful number, since it uses less digits than its factorization.

638764011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650602 (or 1650599 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 638764011 is about 25273.7810982053. The cubic root of 638764011 is about 861.2187565088.

The spelling of 638764011 in words is "six hundred thirty-eight million, seven hundred sixty-four thousand, eleven".