63945218 has 4 divisors (see below), whose sum is σ = 95917830. Its totient is φ = 31972608.

The previous prime is 63945209. The next prime is 63945223. The reversal of 63945218 is 81254936.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49603849 + 14341369 = 7043^2 + 3787^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15986303 + ... + 15986306.

Almost surely, 2^63945218 is an apocalyptic number.

63945218 is a deficient number, since it is larger than the sum of its proper divisors (31972612).

63945218 is a wasteful number, since it uses less digits than its factorization.

63945218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31972611.

The product of its digits is 51840, while the sum is 38.

The square root of 63945218 is about 7996.5753920038. The cubic root of 63945218 is about 399.8858382542.

The spelling of 63945218 in words is "sixty-three million, nine hundred forty-five thousand, two hundred eighteen".