636449055078 has 32 divisors (see below), whose sum is σ = 1274100069600. Its totient is φ = 211949438976.

The previous prime is 636449055071. The next prime is 636449055101. The reversal of 636449055078 is 870550944636.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636449055071) 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 15 ways as a sum of consecutive naturals, for example, 48543988 + ... + 48557096.

It is an arithmetic number, because the mean of its divisors is an integer number (39815627175).

Almost surely, 2^636449055078 is an apocalyptic number.

636449055078 is an abundant number, since it is smaller than the sum of its proper divisors (637651014522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636449055078 is a wasteful number, since it uses less digits than its factorization.

636449055078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20136.

The product of its (nonzero) digits is 21772800, while the sum is 57.

The spelling of 636449055078 in words is "six hundred thirty-six billion, four hundred forty-nine million, fifty-five thousand, seventy-eight".