63311978 has 16 divisors (see below), whose sum is σ = 101974464. Its totient is φ = 29373120.

The previous prime is 63311957. The next prime is 63311981. The reversal of 63311978 is 87911336.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10700 + ... + 15527.

It is an arithmetic number, because the mean of its divisors is an integer number (6373404).

Almost surely, 2^63311978 is an apocalyptic number.

63311978 is a deficient number, since it is larger than the sum of its proper divisors (38662486).

63311978 is a wasteful number, since it uses less digits than its factorization.

63311978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26317.

The product of its digits is 27216, while the sum is 38.

The square root of 63311978 is about 7956.8824296957. The cubic root of 63311978 is about 398.5614534952.

The spelling of 63311978 in words is "sixty-three million, three hundred eleven thousand, nine hundred seventy-eight".