63778216 has 8 divisors (see below), whose sum is σ = 119584170. Its totient is φ = 31889104.

The previous prime is 63778213. The next prime is 63778219. The reversal of 63778216 is 61287736.

It is an interprime number because it is at equal distance from previous prime (63778213) and next prime (63778219).

It can be written as a sum of positive squares in only one way, i.e., 38316100 + 25462116 = 6190^2 + 5046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×63778216² = 8135321672285312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63778213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3986131 + ... + 3986146.

Almost surely, 2^63778216 is an apocalyptic number.

It is an amenable number.

63778216 is a deficient number, since it is larger than the sum of its proper divisors (55805954).

63778216 is a wasteful number, since it uses less digits than its factorization.

63778216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7972283 (or 7972279 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 63778216 is about 7986.1264703234. The cubic root of 63778216 is about 399.5374152446.

The spelling of 63778216 in words is "sixty-three million, seven hundred seventy-eight thousand, two hundred sixteen".