63591978 has 16 divisors (see below), whose sum is σ = 129083040. Its totient is φ = 20880816.

The previous prime is 63591977. The next prime is 63592063. The reversal of 63591978 is 87919536.

63591978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63591977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78693 + ... + 79496.

It is an arithmetic number, because the mean of its divisors is an integer number (8067690).

Almost surely, 2^63591978 is an apocalyptic number.

63591978 is an abundant number, since it is smaller than the sum of its proper divisors (65491062).

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

63591978 is a wasteful number, since it uses less digits than its factorization.

63591978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158261.

The product of its digits is 408240, while the sum is 48.

The square root of 63591978 is about 7974.4578499106. The cubic root of 63591978 is about 399.1481412964.

The spelling of 63591978 in words is "sixty-three million, five hundred ninety-one thousand, nine hundred seventy-eight".