63998178 has 16 divisors (see below), whose sum is σ = 128095680. Its totient is φ = 21316176.

The previous prime is 63998177. The next prime is 63998191. The reversal of 63998178 is 87189936.

It is a super-4 number, since 4×63998178⁴ (a number of 32 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63998178.

It is not an unprimeable number, because it can be changed into a prime (63998173) by changing a digit.

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, 6243 + ... + 12921.

It is an arithmetic number, because the mean of its divisors is an integer number (8005980).

Almost surely, 2^63998178 is an apocalyptic number.

63998178 is an abundant number, since it is smaller than the sum of its proper divisors (64097502).

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

63998178 is a wasteful number, since it uses less digits than its factorization.

63998178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8281.

The product of its digits is 653184, while the sum is 51.

The square root of 63998178 is about 7999.8861241895. The cubic root of 63998178 is about 399.9962041306.

The spelling of 63998178 in words is "sixty-three million, nine hundred ninety-eight thousand, one hundred seventy-eight".