63997994 has 8 divisors (see below), whose sum is σ = 96099168. Its totient is φ = 31964940.

The previous prime is 63997993. The next prime is 63998003. The reversal of 63997994 is 49979936.

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

It is not an unprimeable number, because it can be changed into a prime (63997991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14612 + ... + 18479.

It is an arithmetic number, because the mean of its divisors is an integer number (12012396).

Almost surely, 2^63997994 is an apocalyptic number.

63997994 is a deficient number, since it is larger than the sum of its proper divisors (32101174).

63997994 is a wasteful number, since it uses less digits than its factorization.

63997994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34060.

The product of its digits is 3306744, while the sum is 56.

The square root of 63997994 is about 7999.8746240176. The cubic root of 63997994 is about 399.9958207897.

The spelling of 63997994 in words is "sixty-three million, nine hundred ninety-seven thousand, nine hundred ninety-four".