63728444778 has 16 divisors (see below), whose sum is σ = 127483728960. Its totient is φ = 21238341696.

The previous prime is 63728444771. The next prime is 63728444797. The reversal of 63728444778 is 87744482736.

It is a super-2 number, since 2×63728444778² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63728444771) 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, 1087375 + ... + 1144482.

It is an arithmetic number, because the mean of its divisors is an integer number (7967733060).

Almost surely, 2^63728444778 is an apocalyptic number.

63728444778 is an abundant number, since it is smaller than the sum of its proper divisors (63755284182).

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

63728444778 is a wasteful number, since it uses less digits than its factorization.

63728444778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236621.

The product of its digits is 50577408, while the sum is 60.

The spelling of 63728444778 in words is "sixty-three billion, seven hundred twenty-eight million, four hundred forty-four thousand, seven hundred seventy-eight".