638100705 has 64 divisors (see below), whose sum is σ = 1154285568. Its totient is φ = 298287360.

The previous prime is 638100703. The next prime is 638100713. The reversal of 638100705 is 507001836.

It is not a de Polignac number, because 638100705 - 2¹ = 638100703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638100703) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 774924 + ... + 775746.

It is an arithmetic number, because the mean of its divisors is an integer number (18035712).

Almost surely, 2^638100705 is an apocalyptic number.

It is an amenable number.

638100705 is a deficient number, since it is larger than the sum of its proper divisors (516184863).

638100705 is a wasteful number, since it uses less digits than its factorization.

638100705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 638100705 is about 25260.6552765363. The cubic root of 638100705 is about 860.9205506999.

The spelling of 638100705 in words is "six hundred thirty-eight million, one hundred thousand, seven hundred five".