639630158 has 16 divisors (see below), whose sum is σ = 965301840. Its totient is φ = 317868096.

The previous prime is 639630157. The next prime is 639630221. The reversal of 639630158 is 851036936.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639630157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495578 + ... + 496866.

It is an arithmetic number, because the mean of its divisors is an integer number (60331365).

Almost surely, 2^639630158 is an apocalyptic number.

639630158 is a deficient number, since it is larger than the sum of its proper divisors (325671682).

639630158 is a wasteful number, since it uses less digits than its factorization.

639630158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 639630158 is about 25290.9105806810. The cubic root of 639630158 is about 861.6078439360.

The spelling of 639630158 in words is "six hundred thirty-nine million, six hundred thirty thousand, one hundred fifty-eight".