63993855 has 8 divisors (see below), whose sum is σ = 102390192. Its totient is φ = 34130048.

The previous prime is 63993841. The next prime is 63993857. The reversal of 63993855 is 55839936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63993855 - 2⁸ = 63993599 is a prime.

It is a super-2 number, since 2×63993855² = 8190426955522050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63993857) 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, 2133114 + ... + 2133143.

It is an arithmetic number, because the mean of its divisors is an integer number (12798774).

Almost surely, 2^63993855 is an apocalyptic number.

63993855 is a deficient number, since it is larger than the sum of its proper divisors (38396337).

63993855 is a wasteful number, since it uses less digits than its factorization.

63993855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266265.

The product of its digits is 874800, while the sum is 48.

The square root of 63993855 is about 7999.6159282806. The cubic root of 63993855 is about 399.9871975069.

The spelling of 63993855 in words is "sixty-three million, nine hundred ninety-three thousand, eight hundred fifty-five".